wow wow wow...um, so many places. I know myspace now has a playlist availability with their new players, but, personally, I still use
www.finetune.com, as it's a flash player (faster loading than the myspace player) and has just so many songs..it's actually pretty cool. The code usually goes at the end of the who I'd like to meet section (or derivation thereof with the 'new' myspace layout system). There were a few others, but some actually started charging money (I think there was project playlist, flaashy had one for awhile, as well).