I am another user of Cacheberry with a Blackberry curve, couldn't be happier!
Spent yesterday on a caching trip, before I started got 500 caches near to my starting point, had them sent as an email, saved the file on the Blackberry then imported them. On arrival sorted them by my location, picked up the first one and followed the compass. I have set mine to play a sound at GZ, 3 times yesterday looked around me without moving and there it was!