Sawbuck Gamer, the AV Club's bi-weekly collection of cheap or free games, mostly for browsers and iPhones. It's where I found Canabalt (which I still <3) and there are a few others I've tried which are neat. Dig through the articles and you'll probably find something fun and unusual.
Picked up the game for purely nostalgic purposes, and was pleasantly surprised. Gameplay: Just like the games for the old Nintendo. Even the slide and jump look the same, only with massively souped up graphics.