Some basic links to sites which do not fit in elsewhere but should really be visited!
The biggest forthcoming museum of musical instruments in the world
The pages of the "International Council for Traditional Music"
Homepage of the Society for Ethnomusicology SEM
The very detailed "Atlas" of plucked instruments by Henny de Bruin
The 12 wackiest instruments
12 very unusual musical instruments with videos and description
Everything about and around the "jews harp"
A wonderful page about strange instruments frome all over the world
The pages of Robert Garfias with audio and video files from Southeast Asia
The "house of culture" in Berlin
A page with ethnographic videos, blogs and travelouges
A project exploring endangered music genres worldwide
The homepage of the "Asian-European-Music-Research Journal" with many interesting articles
The homepage of the ethnomusicologist and instrument collector Jeremy Montagu