How am I just now hearing of this Bootstrap Toolkit from Twitter? Maybe I assumed it was this project of the same name.. also built with LESS but not the same Less. Okay, yea, now I see how I could have gotten confused.

Long story short, this Bootstrap is intended to speed up the development of sites by including a robust (and very nice looking) base for typography, forms, buttons, grids, etc. etc. Andy Baio was able to build Supercut.org in an evening using the toolkit - that's a helluva recommendation as far as I'm concerned.