It's legit.
Tonight was the first item sold. Heck. Tonight was the first night anyone knew what the site Tanga.com would be.
They've been running daily puzzles with prizes for the past 30 days in order to get interest up and pushed it to members at boardgamegeek. The site is a joint collaboration between the owner of
Uberplay and the founder of
boardgamegeek. With the people behind it being known and having reputations to consider, the chance of a scam seems rather remote. Note the contact address for
Uberplay.
Yes, it appears to be a woot clone. According to Aldie (aforementioned founder of boardgamegeek), it will have a range of stuff like woot, with board games appearing at times.