Another way to listen to music online

By now most everybody has heard of Pandora, many have heard of Last.fm, and a couple of people have heard of Slacker radio as ways to listen to music streaming online. Theradio.com is throwing in their hat as another contender, and while I cannot say much for their prospects of long term traction, I do like the ability to play songs from the history something that Pandora at least does not let me do. If that is their only killer feature they may struggle but, I do appreciate it. For some reason I think the stations are better than building your own, all of mine end up being Yeah, Yeah, Yeah's all the time. Don't get me wrong I love Karen O, but I need some variety damn it.