There are a lot on CB and all across the Net. It just depends on what you want to do...
Start with BB Appworld. It is similar to Apple's app store.
Facebook
Pandora-streaming radio(allows you to customize radio)
Forward Reply and Edit-allows you to edit forwards and replies
Iheart radio-streaming radio of actual stations
Flycast-streaming radio
Vlingo
Ereader
Evernote
Blackstar
Accuweather
Google Maps