Try thesityone.com now and enjoy it. For almost two years thesixtyone.com couldn't resolve the simple issue of providing successful login on their site (you could login to their old, old.thesixtyone.com, but you couldn't from thesixtyone.com). There was a technical glitch that has been resolved, Hurray!
I love thesixtyone.com because it provides super simple interface, makes listening music a game and above all has this huge display picture of the artist/band cover picture, for the entire length of the song you play. It's a like a radio but picture-cool!