Media center software for Linux

So my fucking Xbox just crapped out (or perhaps just the modchip), leaving me without my beloved Xbox Media Center.

What I'm wonder is if there as any XBMC-like software that I could just run on my fileserver and use via TV-out and a PC remote control.  Preferrably something Mplayer-based.

Can something like MythTV be installed and used simply for its media-playing abilities and not all that Tivo crap?

Any suggestions would be appreciated.

Not for Linux, but you might want to consider Media Player Classic with FFDShow for Windows 2000 (XP/2003 too). It acts as a web server so you can control it from another machine, and it can pull files off SMB servers. The FFDShow filter has a bunch of awesome stuff like sharpening, softening, blurring, noise, dynamic deblocking, perspective correction, cropping, deinterlacing, audio volume normalizing, color map, basic properties, customizable subtitles, OSD, audio channel remapping, audio multibandpass, equalizer, any Winamp 2/5 plugins ever writen, and more. It also supports remote controls. The player and the filter are arguably the fastest and highest quality playing platform. Properly configured, videos look much better than anywhere else. There are hacks to support RealMedia and QuickTime without using the obnoxious players of both, too.