Review my project - Team Search
teamsearchapp.com
teamsearchapp.com
I think you're going to have to give some thought to your customer acquisition process (which is going to be different than the usual B2C or B2B methods you read about most often on HN.)
I assume you know folks in big organizations; otherwise you wouldn't be screwing around with TFS, right?
So, find out how they find out about software, and how they decide to buy it.