My thoughts about your questions:
1. Launch - its fine in its current state and you'll be able to get feedback.
2. I'd use PayPerPost, StumbleUpon, maybe Adwords...here's what YC users say: http://news.ycombinator.com/item?id=104627
3. For this question I'll refer to Chris Anderson http://www.wired.com/techbiz/it/magazine/16-03/ff_free?curre...
Side Note: I wish it had better time tracking - that way I could use it for my freelance web work.