I’ve been using Wiki FM lately, a simple mashup of Last.fm and Wikipedia. (Thanks goes to Florence Devouard, who pointed this site out on the English Wikipedia mailing list.)
In addition to discovering new music (and rediscovering music I haven’t listened to in a long time), I’ve been filling in gaps in Wikipedia’s music photography. There are many band and musician articles that either don’t have photos or are using non-free promo shots, while Flickr has freely-licensed photos that could be used. And for many others, there are fan-made photos that Flickrites would release under a free license if asked. It’s a nice way to work on some of Wikipedia’s image problems without it feeling like drudge work.