1. Must I need an additional service to browse the internet through wi-fi?
No. Just be sure you are using the BB browser.
2. Must I need an additional service to talk on AIM?
Yes, and no. The IM applications that come preloaded on the 8320 you will need a data package to use. There is a 3rd party program called JiveTalk that is highly recommended and I believe the latest beta of it can connect to aim via wifi. It isn't free, but they do have a free 30 day trial.
Yes. Both the preloaded IM applications and JiveTalk use data. In fact, I just purchased JiveTalk. I don't know how much more you could ask from an IM program for a phone.
If you are signed up for the Hotspot @ Home plan, then it won't count against your minutes. If you do not have the Hotspot @ Home plan, it will count against your minutes.
The AIM program from BB will not work over wifi. Maybe in the future it will.
Aww.. the service providers always find some way to screw ya!
Can you explain how the BB logs text messages?
On my bro's Treo, sent/recevied messages are stored in a single thread (appearing as one long conversation). Although the BB does this, it saves an additional thread for each individual msg received. When I delete each single msg thread, it removes the msgs from the long, conversational thread with both the sent/received msgs.
I prefer that the individual thread/msgs be deleted while retaining the same msg in the long, conversational thread (if possible).
I dunno if that makes any sense. I'm having trouble explaining it.