Yesterday, while surfing over the Internet with no purpose I found something really great. It's Humble Indie Bundle, a pack of 5 games made by independent developers which can be purchased at the prize you set by yourself. Amazing. And you can help charity.
Crayon Physics Deluxe, Cogs, Hammerfight, VVVVVV and And Yet It Moves. All pretty cool but Crayon Physics Deluxe seems to be the best for me.