CoD3r-D released a alarm application for PlayStation Portable.

Features:

*Works on 5.50 GEN-X,5.03 GEN-X,CFWEnabler,5.00 M33-X
* 3000-2000-1000
* Sleep Mode Alarm with support for custom MP3 Audio file.
* Power Off Mode Alarm that plays sound in XMB. (Plugin Required – Seperate Package)
* Uses 12 Hour Time system (AM/PM), no more Confusing time conversions
* Display’s Hour’s and Minutes remaining as the Alarm time is being set; updated in real time.
* Alarm can be set up to 23 hours 59 minutes in future, Check for (Invalid – Readjust message).
* Alarm Accurate to the Second.

http://forums.qj.net/psp-development-forum/162921-pspalarm-beta-v2-0-a.html