What are some good, free, online, multiplayer games that you play against other online players?

Does that end with poker, yahoo! games, and fantasy football? What other free games can I download and smash on other people on their computers? Anything like Quake?

How do you get an iphone to utilize java software to play online games against other people?

Can java be downloaded onto an iphone so I can play games online. I like to play games at pogo and have not been able to do so because the new iphone does not support java. Is there anyway it can be done?