I just discovered a new game and I want to share it with you guys. It's a platform game which incorporates roguelike elements like permadeath and randomness everywhere. Give it a try, although I warn you, it's insanely addictive and also insanely hard.
EDIT: The link to the main website -> http://www.roguelegacy.com/
EDIT2: Link to a let's play kind of video by the awesome Day9 (Starcraft2 commentator, instructor and player) -> http://www.youtube.com/watch?v=JuPwILi6sgg