First off, I want to say thanks to the Roll20 team and the great work they've done so far. This system is something I've been hoping to see for some time now.
My suggestion has to do with the menu options available to members outside of games. I find that I look through my Inbox, Discussions, and Games Joined often. The difficulty is that the ways to access them are in different places (Roll20 Community and Member Landing Page). Why not put these options in the drop down "Welcome, (name)" menu?
Any other tips on improving member navigation (pre/post-game)?