Other
Wesleyan University: Instrument Museum Exhibits
This list of exhibits from the Instrument Museum provides information on 16 instruments that are not widely know. Each instrument is displayed in a 360 degree picture that can be rotated for a complete view.
BBC
Bbc: Bitesize: Music of Africa
This site is a part of the About Music site of the BBC, and this interactive site lets you explore various parts of Africa, their music, their instruments, their sounds. Requires Real Player.