VideoHelp http://www.videohelp.com/ is a resource for the advanced consumer (prosumer), has a how-to section (links to many tutorials from all over the web) and forums.
CenterStage http://centerstageproject.com/ is an open-source "Mac Media Center" for Mac OS X.
MediaPortal http://www.team-mediaportal.com/ is an open-source "free MediaCenter" for Windows.
MythTV http://www.mythtv.org/ is an open-source "homebrew PVR project" for Linux.
See also the P2P TV and IPTV entries from our P2P Encyclopedia in this Wiki.
While the entertainment industry is betting high on set top boxes ("media centres") - proprietary technology and user unfriendly DRM included - for TV over the net delivery (IPTV), there is an increasing number of users building their own PVRs (Personal Video Recorder) or a combination of PC, feed aggregator (RSS reader) and BitTorrent technology to get both legally available independently produced content, as well as mainstream TV shows delivered automatically to their PCs.
From an indie media producer's point of view RSS TV can be seen as the future of content distribution: RSS TV = Indie IPTV (or maybe it should be called iPTV: Rip. Mix. Burn. Feed...?)
For details see these related online articles:
Coming to your TV: RSS (describes an alternative use for Apple's upcoming AppleTV - www.p2p-blog.com, 10.01.07)
Hack Attack: Get your TV season pass with Democracy (www.lifehacker.com, 03.10.06)
How to Subscribe to TV Shows Using The Democracy Player, Bittorrent, and RSS (soylentfoo.jnewland.com, 23.02.06)
For finding independently produced video content see: