They seem to work hand in hand with Steam.
They have a new bundle that comes out every two weeks, apparently, and bundles usually hold 4-5 games.
How it works is…if you go a few bucks over the minimum price, it actually lowers the price for everyone else. I bought the 5 pack bundle today for about 5 bucks. The minimum was 4.50 then…but it’s about 4.10 right now. You can choose to pay just that (whatever the minimum price is) or you can go over a little (by clicking “Beat the Minimum”) and that will lower the minimum price for everyone.
I just learned of this site today (after learning about Steam two weeks ago). Bookmarked forever. 