Still a fan of the classic RPG genre like Final Fantasy, Breath of Fire, etc., including ones that are set in modern times like Earthbound and Sci-Fi like Phantasy Star. I do still pick up the occasional 2D platformer though like the Mega Man series which I feel does 2D platforming better than Mario.
I'd also like to see a really good Zelda/Brain Lord/Soul Blazer type clone someday too. A good overhead adventure with a good narrative, RPG elements, secrets to find, and puzzles to solve would be a lot of fun too.