"Internet Radio" Suggestions Please?

What are good "Internet Radio" sites?

I know I will get stones thrown at me for mentioning this in an "audiophile" forum, but maybe some of you will take pity on a music listener with a taste for adventure.

I have recently discovered over the last year, two "Internet Radio" websites that I really enjoy....

Last.fm: I have met you few people on Last.fm that have introduced me to some music that I didn't even know existed. I have found myself listening to it more and more. I like it!

Blip.fm: Awful quality, but I like the community and they way it links to Twitter.

For me, these have been very powerful tools for me to discover and share music. Are there other sites? I like to share music (especially playlists) and discover new music.

Thanks!