This is my first post in a really long time. Wow.
Ah, free stuff. My favorite type of stuff...

I like Cabal online. It's an addictive MMORPG.
..:: Cabal Online - 4th Anniversary ::..

And Twelve Sky 2.
Also an addictive MMORPG, but with an Asian theme.
Twelve Sky 2 | Free online MMORPG at Mayn Games

Both of these games have a pretty high player population.

Aside from MMORPGs, I play Stepmania a lot.