Apalon has released My Alarm Clock 1.0 (www.apalon.com/) on the Mac App Store. It requires Mac OS X 10.6 or higher, costs US$0.99 and is available in the Utilities category.
My Alarm Clock turns the Mac into an alarm clock that sings users’ favorite songs, provides designer themes and current weather information, and a sleep timer. You can choose from analogue and digital, modern and classic, retro and futuristic skins. My Alarm Clock also provides multiple alarm support.