HAHA, ok I'll just repeat some of what I've told you (alien language) yesterday:
FB for BB
Google Synch (coz my BB is linked to my gmail and google calendar and contacts)
Google Maps (gps on ur phone)
ym for BB
That's what I think is useful for you.
Others nice to have:
the Color ID (led light changes color according to whoever sends u a msg)
I think the other girls in DA group have other apps for this
I also have whatsapp, not that much useful as other apps coz I just talk to one person (Alt) there - it's for BB-iphone messaging.
I have twitter for bb, Voxofon (allows me to call abroad for very cheap rate thru my phone - like not even a cent to make US calls, and deducted on my local minutes plan), Tripcase (coz I travel a lot so it update me on flight status, etc.)
If you want games... Just Search "Gold Thumb" in the Blackberry App World. Those are some of the funnest games I've found for my Blackberry. It has Connect 4, Battleship, Blackjack, and a few others... but basic games like that.
I use Skype Mobile ALOT.
These the the list of Apps I use pretty much on a Daily/Weekly basis, I think 99% of them are Free;
-Scanner Radio (Police Transmitter)
-Xenozu (Youtube Viewer)
-Opera Mini (Replacement for the Internet explorer)
-The Weather Channel
-Pandora (Music Player for Random Musics)
Everything I listed is free except the whatsapp (trial period only - but I'm not renewing it anyway coz I rarely use it) and as for voxofone, I have to have credit there but it's so cheap like 6usd allows me 600 minutes of call time, ha.
I already have poker on my BB installed so it's free.