I adopted my wife's old 8900 (not really that old). She upgraded to a 9780 and I moved up from my old 8310.

Wow, what a difference. Recently my 8310 was lagging with the latest ver of BBM. I was almost ready to give up on blackberry all together.
But with my 8900 its renewed my liking for blackberry all over again.

Other than that I'd like to find some decent (and free) apps for it that are actually worth installing.

Is app world on it? If not, download it and browse away.

I suggest Pandora. (EDIT: I hope Pandora is available in Canada. I didn't think about that before I posted.)

If you travel, or even if you don't, you'll probably find Poynt useful.