Only one person chiming in on this one...? I'm wondering the same also. I know of tetherberry of course but I also have heard good things about mobishark. Plus mobishark has a free trial. Its kind of hard dropping 50 bucks on an app without making sure it works good and all.

I believe there is also one called pdanet. They also have a trial which I tried. I couldn't get it to work half the time. I've heard that it works better for other phones other than bb's.