Here's another site you might be interested in playing billiards online on. It's Candystand.com. They have a game called Billiards Classic which seems to be
a whole lot of fun.
One of the issues I did have with getting into the billiards game was needing to download the shockwave plugin (as I am using the Firefox Browser to play billiards) so it took a few minutes of sorting out the correct plugin before I was actually able to play the game itself.
There's a lot of fun to be had on CandyStand.com