I never got Nimbuzz to work on my Storm1 with OS 5.0.0.328. I did the 30-day free trial from Beejive and paid the $14.99 (for a user license, device license is $9.99) and never looked back. I don't usually pay (at all, let alone that much) for BB apps unless they are well worth it. Nice interface and supports basically any/every IM handle out there...
Other free option would be m.ebuddy.com but I don't like that near as much..
I have downloaded trial versions of both and I was wondering how you add contacts to facebook chat?? whenever i log in with my e-mail address and password none of my contacts pop up for both.