Re:Don't playa hate, congratulate! (Score 1)

For #1, check out TVersity (free). There's a decent step-by-step here.

I've had it running on my setup (xbox 360 wired in, Vista RTM on a laptop connected wirelessly) for a while now... works flawlessly for streaming audio, pictures, video... if you've got the codecs, TVersity will stream it.

It replaces the Media Player-based media sharing... not sure how it will affect your MCE setup.