Nice work so far. Looks great!
Some features/things I noticed:
1. Color/background color customization would be awesome. Some colors are really hard to see against the white background.
2. Can the offline buddy list not be expanded by default, and instead collapsed? People logging in will notice their right side menu spamming like crazy when they first open the program, while looks cools and all, but might eventually prove distracting, and overall just annoying after a while. On that note, maybe add [+] [-] collapse/expand tree buttons, to drive home the point that those menu's are expandable? (up to you)
3. When *I* log in, both my main window and my info window are always prefaced by the following:
-----------------
This program cannot display the webpage
Most likely causes:
You are not connected to the Internet.
The website is encountering problems.
There might be a typing error in the address.
What you can try:
Check your Internet connection. Try visiting another website to make sure you are connected.
Retype the address.
Go back to the previous page.
More information
-----------------
Before actually posting the actual data (be it a channel or w/e should be in the text window). My guess is that you are loading a web page in the info and main window in addition to displaying inc. chat from the server, but it seems like that connection is throwing an error?
4. When I was closing the program (thinking it would quit), it simply popped up the logon screen instead. I was hoping you could make the quit button (the X) an actual quit button, and maybe design disconnect/new connection buttons elsewhere on the screen. (Not a big deal in the long run, just a usability thing; no one like having to tell their programs to close...twice

).
Suggested new feature:
5. **Excellent** work on the ability to have *multiple* info windows up <3 vs AORC's single info window ability. Along those lines: Is it possible to have it so that tells could be double-clickable, and they would open up in their own chat window (the ability to have more than one info window is already there)? You could use the programming of the info window, and change the layout/style a bit. Having seperate windows available for tells would severely cut down on the crap-load of mistells I have when using AORC (from in-game, I'm used to only needing to switch channels [i almost always use the external/separate tell window when talking to multiple ppl/long convos, or /r for one person ftw] so aorc just kills meh

). No big deal though -- just a thought.
Hmm, and if you need help: lemme know. I do vb.net and some visual c/c++ as well.
Other than that: again, great work so far!