I have a new app coming to the store, a quickie named Enumero. It'll be free to the first few hundred downloaders, then goes to Tier 1 (0.99)
It's a app got counting things (aloud, in my voice), and is kind of a mental exercise. Future releases will count in other languages and use other voices.
Enumero actually got rejected for claimng to be able to run in the background under 4.0 when it couldn't. So I took out the flag that said it could do that.
But it took so long for Enumero to get reviewed again that I significantly updated it in the mean time - so now it's using a different engine internally and _can_ count in the background under 4.0.
Let's see how long it takes for it to get noticed!