Did everyone forget Foobar? Hands down the best, its not a resource hog, and it does pretty much a lot of stuff everything else already does. Compared to itunes which takes tons of memory.
not me I'm currently listening to my xm radio online with it, and i'm about to hop onto xbox live
ps, i've got a 3000 song library on a dedicated home server, and it takes very little, if any additional resources, and it's easy to find what i'm looking for. the built in library viewer is easy to use and full-proof