
Right  now I'm playing with 
MeeMix Internet Radio.  Meemix is a browser-based player which offers both an audio and video mode.  
MeeMix thinks of itself as an Internet community which offers members the  ability to create and listen to personalized radio stations. MeeMix uses a  "taste prediction algorithm" which tries and figure out what you will want to  hear - not unlike what Internet stations like Pandora or Last.fm pioneered.  (Right: MeeMix Player, Screenshot by Corey Deitz, Graphic Credit: ©  MeeMix)  
I started by typing in "Abba" (It's just my default music search term) upon  which MeeMix began playing "Take a Chance on Me" - a big 1978 hit for the band.  MeeMix then decided I should hear Donna Summer's "Bad Girls" followed by a 1979  disco hit by Cameo. At this point, although still entertained, I was a bit  curious why MeeMix had deserted me on a dance floor dressed like John Travolta  in "Saturday Night Fever".  
I decided to manually advance to the next song and MeeMix brought up Leif  Garrett and "I Was Made For Dancin'". At this point I ripped off my white  jacket, threw it across my office and just started doing the "Hustle".  
MeeMix has a "Mood Control" with three controls: Surprize  Me, Pulse, and Volume. I cranked  Surprize Me all the way to the max and a song called "(Funny) Bone" by Chic  began playing - another late '70s tune I've never heard. I definitely was  surprised.  
MeeMix has a Not or Hot slider control  which let's you tell it whether or not you like what it's picking for you to  hear. MeeMix provides a lot of other controls to promote interaction, too: a  favorites tool, another to block cuts, the ability to buy the CD you're  listening to, recommendation tools, and more.  
MeeMix is fun to play with and free to use. First time visitors can try it  out before registering and create up to 3 radio stations that allow you to  listen to 5 songs on each one.