I use BeeJive’s Jivetalk on my Curve and Pearl. I bought the transferable deal awhile back which was like 30 bucks if I’m not mistaken.

I really like it because I think I have like a screen name for all the messenger service available to humans hahaha. The Jivetalk has its ups and downs, for the most part I like it because I only use one program especially if I am chatting with different people from different IM Clients.

Sometimes, i get error messages but still works out fine.

I believe you can try it out for 30 Days. Check their website out. Im sure you will like it.. And oh, i can change the color of the LED so I know if a message is from Jivetalk, I set mine to Blue. Very cool, check it out!

I know a few people that use it and love it. But like francis stated they also use just about every im client out there. I personally only use AIM and google talk so i have both of those programs installed on my berry. If you dont use a lot of different clients it seems like a waste of $$ to me.