i just added rosario+vampire sounds for my comp and i thought i'd add ...
here are the sounds for download: link
u can play them on your media player to see if u like.
to add them as system sounds: start button > control panel > hardware and sound > change system sounds
under the 'programs' list, pick the sound u want to change. i picked 'device connect' (click 'browse' and find wav). then i picked 'device disconnect' and added the other wav sound. 'exit windows' is another good one to change.
save ur new sound scheme before u click 'okay.' done.