The popular social networking blog Mashable has a post of 90+ sites and tech tools related to all facets of making and interacting with music. The comments list is a year+ growing spore of new and obscure and interesting plugs for music related sites. Definitely worth browsing, as you are sure to find some music tools that you didn’t know about…
Check it here: http://mashable.com/2007/07/06/online-music/