According to ReadWriteWeb, Lift is a social engineering project "built as a way to share daily accomplishments marking progress towards your goals with friends interested in the same sorts of goals". Kinda like 750 words.
So why am I writing about a non-existent site you can't join yet? Because Obvious Corp. are the Twitter diaspora - Ev Williams, Biz Stone and Jason Goldman. Yes, that Ev Williams.
Don't bet against it.