E' strano, a me sembra che sia tutto a posto.
Unica cosa che mi viene in mente è che il Toast dura molto poco e l'evento BOOT_COMPLETED sull'emulatore avviene quando l'emulatore stesso non è ancora usabile, anzi c'è il lock screen. Ci vorrebbe un evento più "persistente", tipo una notifica che rimane nella barra. O ancora meglio, affianca al toast un Log.d("TAG","evento BOOT COMPLETED"); che poi vai a verificare nel LogCat dell'emulatore.
Niente !!!

public class OnomasticBroadcastReceiver extends BroadcastReceiver
{
@Override
public void onReceive(Context context, Intent intent)
{
/*
Intent myIntent = new Intent(context, OnomasticiActivity.class);
context.startActivity(myIntent);
*/
Log.d("TAG","evento BOOT COMPLETED");
Toast.makeText(context, "Receiver OK !", Toast.LENGTH_SHORT).show();
}
}Riposto il Logcat
03-05 19:29:03.556: D/AndroidRuntime(698): >>>>>> AndroidRuntime START com.android.internal.os.RuntimeInit <<<<<<
03-05 19:29:03.566: D/AndroidRuntime(698): CheckJNI is ON
03-05 19:29:04.625: D/AndroidRuntime(698): Calling main entry com.android.commands.pm.Pm
03-05 19:29:04.695: W/ActivityManager(93): No content provider found for permission revoke: file:///data/local/tmp/Onomastici.apk
03-05 19:29:04.716: W/ActivityManager(93): No content provider found for permission revoke: file:///data/local/tmp/Onomastici.apk
03-05 19:29:05.035: D/dalvikvm(93): GC_CONCURRENT freed 740K, 11% free 8013K/8903K, paused 7ms+19ms
03-05 19:29:05.285: I/PackageManager(93): Removing non-system package:ldc.android.apps.onomastici
03-05 19:29:05.285: I/ActivityManager(93): Force stopping package ldc.android.apps.onomastici uid=10043
03-05 19:29:05.396: I/PackageManager(93): Package ldc.android.apps.onomastici codePath changed from /data/app/ldc.android.apps.onomastici-1.apk to /data/app/ldc.android.apps.onomastici-2.apk; Retaining data and using new
03-05 19:29:05.405: I/PackageManager(93): Running dexopt on: ldc.android.apps.onomastici
03-05 19:29:05.636: D/dalvikvm(709): DexOpt: load 48ms, verify+opt 87ms
03-05 19:29:05.655: W/PackageManager(93): Code path for pkg : ldc.android.apps.onomastici changing from /data/app/ldc.android.apps.onomastici-1.apk to /data/app/ldc.android.apps.onomastici-2.apk
03-05 19:29:05.655: W/PackageManager(93): Resource path for pkg : ldc.android.apps.onomastici changing from /data/app/ldc.android.apps.onomastici-1.apk to /data/app/ldc.android.apps.onomastici-2.apk
03-05 19:29:05.766: D/dalvikvm(93): GC_FOR_ALLOC freed 466K, 12% free 7907K/8903K, paused 112ms
03-05 19:29:05.785: I/ActivityManager(93): Force stopping package ldc.android.apps.onomastici uid=10043
03-05 19:29:05.875: D/PackageManager(93): New package installed in /data/app/ldc.android.apps.onomastici-2.apk
03-05 19:29:05.985: I/ActivityManager(93): Force stopping package ldc.android.apps.onomastici uid=10043
03-05 19:29:06.306: D/PackageManager(93): generateServicesMap(android.accounts.AccountAuthenticator): 2 services unchanged
03-05 19:29:06.346: D/PackageManager(93): generateServicesMap(android.content.SyncAdapter): 4 services unchanged
03-05 19:29:06.356: D/BackupManagerService(93): Received broadcast Intent { act=android.intent.action.PACKAGE_REMOVED dat=package:ldc.android.apps.onomastici flg=0x10000010 (has extras) }
03-05 19:29:06.396: I/AccountTypeManager(328): Loaded meta-data for 1 account types, 0 accounts in 27ms(wall) 10ms(cpu)
03-05 19:29:06.436: D/dalvikvm(217): GC_EXPLICIT freed 279K, 8% free 6537K/7047K, paused 5ms+13ms
03-05 19:29:06.495: D/PackageManager(93): generateServicesMap(android.accounts.AccountAuthenticator): 2 services unchanged
03-05 19:29:06.495: D/PackageManager(93): generateServicesMap(android.content.SyncAdapter): 4 services unchanged
03-05 19:29:06.735: D/BackupManagerService(93): Received broadcast Intent { act=android.intent.action.PACKAGE_ADDED dat=package:ldc.android.apps.onomastici flg=0x10000010 (has extras) }
03-05 19:29:06.735: V/BackupManagerService(93): updatePackageParticipantsLocked: ldc.android.apps.onomastici
03-05 19:29:07.205: W/RecognitionManagerService(93): no available voice recognition services found
03-05 19:29:07.405: D/dalvikvm(93): GC_CONCURRENT freed 487K, 11% free 8000K/8903K, paused 8ms+33ms
03-05 19:29:08.295: D/BackupManagerService(93): Received broadcast Intent { act=android.intent.action.PACKAGE_REPLACED dat=package:ldc.android.apps.onomastici flg=0x10000010 (has extras) }
03-05 19:29:08.295: V/BackupManagerService(93): updatePackageParticipantsLocked: ldc.android.apps.onomastici
03-05 19:29:08.495: D/dalvikvm(188): GC_CONCURRENT freed 3250K, 37% free 7778K/12167K, paused 5ms+43ms
03-05 19:29:08.705: I/AccountTypeManager(328): Loaded meta-data for 1 account types, 0 accounts in 2091ms(wall) 11ms(cpu)
03-05 19:29:09.245: D/dalvikvm(188): GC_CONCURRENT freed 93K, 32% free 8309K/12167K, paused 6ms+12ms
03-05 19:29:09.806: D/dalvikvm(188): GC_FOR_ALLOC freed 600K, 31% free 8421K/12167K, paused 117ms
03-05 19:29:10.186: D/dalvikvm(188): GC_CONCURRENT freed 674K, 29% free 8706K/12167K, paused 5ms+12ms
03-05 19:29:10.325: D/dalvikvm(188): GC_FOR_ALLOC freed 182K, 26% free 9027K/12167K, paused 111ms
03-05 19:29:10.346: I/dalvikvm-heap(188): Grow heap (frag case) to 10.134MB for 1286224-byte allocation
03-05 19:29:10.466: D/dalvikvm(188): GC_FOR_ALLOC freed <1K, 16% free 10283K/12167K, paused 74ms
03-05 19:29:11.405: D/dalvikvm(93): GC_EXPLICIT freed 442K, 12% free 7884K/8903K, paused 7ms+51ms
03-05 19:29:11.428: D/AndroidRuntime(698): Shutting down VM
03-05 19:29:11.455: D/dalvikvm(698): GC_CONCURRENT freed 101K, 78% free 456K/2048K, paused 1ms+2ms
03-05 19:29:11.455: D/jdwp(698): Got wake-up signal, bailing out of select
03-05 19:29:11.455: D/dalvikvm(698): Debugger has detached; object registry had 1 entries
03-05 19:29:11.466: I/AndroidRuntime(698): NOTE: attach of thread 'Binder Thread #3' failed
03-05 19:29:25.755: W/WindowManager(93): Failure taking screenshot for (90x150) to layer 21010
03-05 19:29:25.906: W/NetworkManagementSocketTagger(93): setKernelCountSet(10009, 0) failed with errno -2
03-05 19:29:26.066: D/dalvikvm(93): GC_FOR_ALLOC freed 119K, 12% free 7905K/8903K, paused 111ms
03-05 19:29:26.285: D/dalvikvm(93): GC_FOR_ALLOC freed 56K, 11% free 7932K/8903K, paused 103ms
03-05 19:29:26.555: D/dalvikvm(93): GC_FOR_ALLOC freed 49K, 11% free 7955K/8903K, paused 176ms
03-05 19:29:26.665: D/dalvikvm(93): GC_FOR_ALLOC freed 46K, 11% free 7983K/8903K, paused 98ms
03-05 19:29:26.785: D/dalvikvm(93): GC_FOR_ALLOC freed 47K, 11% free 8008K/8903K, paused 97ms
03-05 19:29:26.816: V/TransportControlView(93): Create TCV com.android.internal.widget.TransportControlView@4124d428
03-05 19:29:27.026: D/PhoneStatusBar(147): disable: < expand icons alerts ticker system_info back home RECENT* clock >
03-05 19:29:27.076: W/SoundPool(93): sample 0 not READY
03-05 19:29:27.285: D/PhoneStatusBar(147): disable: < expand icons alerts ticker system_info BACK* HOME* RECENT CLOCK* >
03-05 19:29:32.375: I/WindowManager(93): Lock screen displayed!
03-05 19:29:32.396: W/NetworkManagementSocketTagger(93): setKernelCountSet(10009, 1) failed with errno -2
03-05 19:29:33.116: D/dalvikvm(147): GC_CONCURRENT freed 365K, 31% free 6164K/8839K, paused 5ms+53ms
03-05 19:29:41.696: D/PhoneUtils(176): hangup(): no active call to hang up
03-05 19:29:42.895: W/WindowManager(93): Failure taking screenshot for (90x150) to layer 21005
03-05 19:29:43.046: W/NetworkManagementSocketTagger(93): setKernelCountSet(10009, 0) failed with errno -2
03-05 19:29:43.196: V/TransportControlView(93): Create TCV com.android.internal.widget.TransportControlView@4121b7c0
03-05 19:29:45.296: D/PhoneUtils(176): hangup(): no active call to hang up
03-05 19:29:45.385: W/NetworkManagementSocketTagger(93): setKernelCountSet(10009, 1) failed with errno -2
03-05 19:29:45.456: I/WindowManager(93): Lock screen displayed!
Sembra che il Receiver non parta....