FWIW, last night I started on a tool to expose your PC's video files as thumbnail-toting RSS feeds to VideoCenter.

My intended use for this is to run it on my PVR so I can pick and choose PVR recordings to download/stream with transcoding them on the fly, but unlike other solutions doesn't rely on MythTV, VDR or any other particular backend. It just handles videos.

Theoretically, there's no reason it couldn't also expose RSS feeds like YouTube's through itself and, again, transcode on the fly when requested.

It's still a way off a release, but should support Windows, Linux and OS X. It'll also be usable direct from the web browser with Media Player or any random streaming mplayer front-end.

It's similar to Janne Makinen's "knots", but with a greater concentration on integration into auto-downloading and synchronisation (assuming that if Video Center doesn't do this yet, it will do soon)