Where is UpFront Documentation?

I see in The Hub that there is basic information on WordPress (which I already know) but I couldn't find documentation on using UpFront, WPMU themes, etc. Do you have a getting started specific to WPMU? Where would I find detailed documentation on UpFront (not WordPresss). I knocked around and looked as much as I could.

(Also, I couldn't fill out this form in Safari, the dialog wouldn't let me select fields because the cursor seemed to be offset.)