I still use it, and most of my friends still use it, though I suspect that using it solely for the statistics probably makes me (well, my friends too) an odd man out.

The only time I've ever considered switching was when I was debating writing a program to take the statistics myself, but then again... why bother?

Regardless, I know way more people using last.fm than I do who use Grooveshark, and I don't really know anybody who uses Spotify. I'm not worried about last, but you never know, maybe I should be.