Android version of CacheSense is in private beta now.
Other apps for other platforms are coming, there'll soon be more than you can shake a stick at - Groundspeak have not chosen to support the BlackBerry platform at all, they are simply staging the release and the way it shook out, CacheSense was first out of the gate. Don't let platform politics overshadow the main event.. the Geocaching Live API is huge leap forward for all of us..
Cheers,
Bruce