If you are looking for a fast paced online game, which is fun and addictive at the same time, try games by Star Arcade. They include: Star Tictactoe, Star Diamonds Capture, and Star Mancala.
My personal favorite is Star Diamonds Capture.
Oh, and its free to play. Requires registration for its points system, but that takes 10 secs.
if you want something more fast paced you can try out Boom Boom Gems. it's kind of like Bejeweled but much faster and there are ways to sabotage your opponent with special items and abilities. definitely check it out!