If you followed my other (tiny) tutorial on creating a mediacenter then you should now have your PC linked to your TV.
If youre a fan of Singstar and similar games for the consoles, then you may like this… An open source (free) karaoke game for your pc!
[QUOTE]A free and open source karaoke game inspired by the Singstar™ game available on the Playstation®. It allows up to six players to sing along with music using microphones in order to score points, depending on the pitch of the voice and the rhythm of singing[/QUOTE]
Download
Windows
UltraStar Deluxe Installer (10 MB) (If you´re not sure, use this one):
With possibility to download 40 songs and some additional themes
UltraStar Deluxe ZIP (22MB) – With three songs and additional themes
UltraStar Deluxe ZIP Lite (13,6MB) – without songs and extra themes
Linux / Mac OS X
There is no pre build package available yet, but this version is known to work well in Wine – a tutorial can be found in the USDX Wiki here.
Links of interest
Linux getting started guide – Forum thread
Linux compiling guide – Wiki
Mac OS X Snapshot version – Forum thread with dmg file
Mac OS X the actual progress – Forum thread
Mac OS X working UltraStar – Eddie (the author) has joined our team, this his old project (NonDeluxe!)
Additional Content
Themes – More Eyecandy 
Plug ins – For more game modes in the party mode
Songs – Different songs either released under Creative Commons licenses or where the project obtained the permission to distribute them