Why do my iPod Touch's apps keep closing out?

Check that you have the latest version of the iPod Touch software. The latest version of your software fixes any bugs that prevent apps from opening or spontaneously closing.

If you have the 3.0 software, very few apps still are not capable for that software, and will never stop closing out.

If you have the iOS4, then check to see that the app works with iOS4. Most apps should have been updated within the couple weeks of the release of the iphone 4.

Also, try redownloading the apps, which may help.