I have Alarmclock Plus which runs in the background and isn't affected by incoming calls or text. I installed the Infotime Alarm Clock via an 'iDEN Content Uploader' site. The i465 will suspend a running (in foreground) java application when a call or SMS arrives. I must restart the suspended app. Not too cool for an alarm clock as I may have phone and sms set to silent or vibrate. Your program must operate like the 'Alarmclock Plus' in the background.

how bout mp3 or wma or amr support for alarms and individual sound selection options for different alarms?

Clock application should suspend itself for incomming call and restart after call completed. I decided not to use the application because it interfered with answering incomming calls.