Winamp has a couple of different key changing plugins, the most popular called Pacemaker, and if you use winamp to also play your video files (mpg, avi, wma, Mpeg, DIvx etc) then you can use the keychanger to change key of the vids etc... not sure what affect it will have on the speed of the video etc but it WILL change the key
for better or worse... - tig