Heres a web site dedicatied to the moding of everything known to man:
http://www.hackaday.com/
the cool thing is (which the name suggests) there is something new everyday. and if you are bored you can check out their archives which goes back september 2004, that means there are over 700 mods.
any one else know of any cool sites?
Another web-site with a lot of schematics and information ...
http://www.freeinfosociety.com/electronics/schempage.php?cat=1