Handelabra Studio has recently updated three of their apps to provide full VoiceOver support.
The apps are RE.minder, GAME.minder and Better Clock.
The first 2 of these are free, whilst Better Clock is 99 cents.
I've tested RE.minder, and was very impressed with it's accessibility.
Unfortunately, I was not able to test GAME.minder, as it is not available in my regional iTunes Store (looks like it might be US only). I would expect it to have a similar level of accessibility to RE.minder, and hopefully somebody can post confirmation of this to the App Directory.
The developers have kindly given us 2 promo codes for Better Clock. I am offering these to the first 2 people to add a comment to this post. Be warned, though, that I shall be hoping you will post a report on this app in the App Directory in return for the code!
Better Clock uses multi-tasking and local notifications to make sure your alarm will sound, even in the background. The sleep timer feature can be used with any audio app that supports background audio, such as Pandora, Last.fm or Bookmark. The app claims to have full VoiceOver support.
Update: both promo codes have now gone.
Update 3: more promo codes posted by Handelabra Studio. See comment number 5.