I have been using JiveTalk since my post above, and I was faced with the decision on what to stick with GTalk(+Transports) or JiveTalk.
Now there are some things that GTalk does that I wish JiveTalk had. If they were added to JiveTalk, I would be very happy.
1.) Icon Indicator in top bar for new chat message received
2.) Address Book integration - option menu includes "IM [Contact Name]"
3.) Display Chats in the Message List (on/off option in settings)
4.) ** Display an Avatar to other users (especially in MSN)
** I know this is not available in GTalk or any other BB IM app, but it would be nice.
Final verdict:
JiveTalk over
GTalk easily