what about mobiola video studio ?
http://mobiola.com/ - try a trial, it's FREE!
I bought my blackberry last month and I have been searching for apps to help me realize the video conversion for my peal. I have tried several soft. Couple days ago I knew ImTOO 3GP Converter from a friend and I noticed this software had many functions especially for blackberry. I took the trail and it's really nice. Today I found the software is on sale only $13. In case someone needs it, just want to share this with you. Good luck.