I know that Heavy has been around for ages now, but it was only recently that I started listening to their really good internet radio. They have a wide selection of styles and era, and lots of songs (frequently updated, also!) on each playlist. Definately worth checking out!
Speaking of internet radio ...
I highly recommend that everyone set up a Webjay and/or Audioscrobbler account. I use my Webjay playlist for Radio BiBaBiDi, but I like to also use Audioscrobbler because you can listen to their internet radio based off of what you listen to. Audioscrobbler comes with a plugin for your media player which automatically updates your statistics, so the whole world can see exactlly what you've been listening to! Check out what I've been hearing recently here.