does anyone here use last.fm still?

Me. Why?

I used to and I like that it plugged into iTunes, but Pandora is a lot better and I think it plays more relevant music then Last.FM which is more keyword based? If I typed Rock, it would bring classic, new, pop, ect. Where as Pandora if I had AC / DC or Coldplay or something it would play music that sounded similar and of that genre.

it seemed there was once a larger user base a year or so ago

Uhm, pretty sure there still is a large user base. Pandora is blocked in many countries outside of the US and going through a US proxy all the time is simply not worth the trouble.