Nintendo for me. 3DS looked great both in concept and in line-up (also what they didn't show, paper mario 3ds!), I loved the zelda visual style, golden sun and donkey kong country wii.
Sony was ok, but except for portal there weren't any real surprises. And nothing 2010 that could really grab me. Still have a small backlog, so I won't complain too much.
I don't own an xbox, but nothing on Microsofts conference convinced me that I needed one. The kinect stuff looked ridiculous and I own a wii since day 1.