iRooster 2.2

@Alex

I use iCal to play a song at a certain time in the morning too. I dont think you need to change the energy saving settings, as iCal wakes the computer up from sleep anyway.

I use iTaf http://itaf.sourceforge.net/ ; I'm surprised nobody over here has mentioned it yet. It's free and fantastic and very reliable, with both sleep and wake alarms...

Agree with the 1st poster, this is much easier and free with iCal, no scripting required. Also is pretty darn reliable.

I use Awaken. It works fine and is very reliable. Now it even has a back up alarm, for in case there is something wrong with iTunes.
BTW the look of this application is very similar to Awaken...

Waking up on time is very, very important. That job is not to be trusted to a computer. Leave it to as simple a device as you possibly can.

I strongly recommend Aurora, as supposed above.
It's feature-rich, e.g. the new Version 3 is able to handle eyeTV
and it apple-script-able

try it!

I also use alarm clock. I tried Aurora last week, and twice in a row the alarm died after hitting sleep--I woke up 10 minutes before I was supposed to be at work. Alarm clock has always been reliable for me, is free, has an extensive feature set, and an active, friendly developer.

As someone asked above me as well, Alarm Clock can be set to play only one song, or an entire playlist, or even rooster sounds if you happen to have some outside your iTunes.

Use Aurora. jJust as full featured, if not more, and free. It was even featured on this very blog.

http://www.tuaw.com/2006/11/28/aurora-3/

I use an app called alarm clock its free and the best alarm clock app out there (and i have used many). I have used so many that just plain didnt work. This one does not even require iTunes to work.

Users will love its simplicity, reliability and ease of use...

http://www.apple.com/downloads/macosx/system_disk_utilities/alarmclock.html

download it and lurrrve it!

If it came with actual rooster sounds to make me feel like I'm on a farm I might have gotten it. Maybe a moo or two in the background for authenticity