The social software tool del.icio.us is something that libraries everywhere should embrace. We’ve started to use it in the various subject departments where I work, and it has given us the ability to categorize web tools that we deem as useful.
Here is a link for the Music Department’s del.icio.us page,
http://del.icio.us/freelibrarymusic
Each department can be viewed by selecting the otherlibrarydepartments tag. We’ve definitely added quite a number of bookmarks for our department, and have split them into several categories; Classical Music, Copyright, Jazz, Music Reference, Record Industry, Sheet Music, & Web 2.0. Almost every link has a citation or paragraph describing the website and its usefulness, and I hope to add a description for every website and clean up all of the tags relatively soon.