I was on t61 fairly early but never used the site much. I use it much more after the redesign. Now it's on par with Pandora as my go-to music source. Pandora is more reliable; thesixtyone is experimental.

OTOH: last.fm has lost me. It's like facebook for musical tastes, except none of my frinds use it. Many of my friends and relatives use Pandora and they seem to get the new t61. I think a lot of people are looking at formats like last.fm and the old t61 and saying "I don't need a facebook for every niche of my life".