Windows Mobile: Streaming Music
Check out Orb to stream your music and videos to your Windows Mobile phone.
It renders video on-the-fly, using <30% CPU. The only issue I've seen is that this xmltv.exe runs (eating ~25MB RAM) even though I didn't opt for TV integration.
Keep an eye on VibeStreamer, as the coder (yes, it’s one guy) is going to implement a mobile device version soon.