Here are some apps that are being used without problems even though they are listed as incompatible with the Thrive in the Google Play Store. If you can locate the APK file, they can be side-loaded. I will update this list as users post changes. Use At Own Risk.
Craigslist Mobile
ESPN Goals
ITV Player
Modern Combat 3 (needs build.prop hacks)
NFL Pro 2012 HD (needs build.prop hacks)
Redstone Federal Credit Union Mobile Banking
Smurf's Village
Note: For information on build.prop hacks, see this thread:
http://www.thriveforums.org/forum/toshiba-thrive-apps/9384-how-install-incompatible-apps-editing-build-prop.html#post86408