Clayton R. Wright just emailed me this really cool site where you can go and play 100's of top hits from the 1950's, 60's, 70's and up to 1982. I found several of my old favourites like Crimson and Clover, Stairway to Heaven and Honkytonk Woman. The best thing is that this site is free and you can just pick a play list and go back to work, listening to the music in the back ground.
All of the music appears to be in Flash format so you just need the Flash Player installed. And the flash files download quickly while playing, then frees up your network connection for other things.
Check it out at http://www.tropicalglen.com/