Take a look in the titanium threads in the software forums.
http://forum.ppcgeeks.com/forumdisplay.php?f=82 There's plenty of tweaks you can do. Read up in there and you'll see how add panels, edits panels, etc. There's plenty of things you can do to modify it (titanium doesn't seem to get a fair shake w/ TF3D around). I'm just waiting for someone to port the Neo theme for titanium, now THAT's sweet...
As dragon noted, you're gonna need chome editor first and foremost, then you can make plenty of changes.