Ultrastar-NG

This could be a funny game to play - a Karaoke that tells you how well you're singing... The ideal party game. :-P

(from Debian Package of the Day)

The Lifehouse Method

From The Who's master musician and guitar hero Pete Townshend comes a new web service that aims to create a "theme song" for each and every of us, and so discover "the simple secret of a note in us all". :-)

From this article it seems the system is quite raw and unrefined now but it works for free until July so it should be worth a try.

(from Ars Technica)