Quake Live offers the fast-paced online combat of Quake 3 Arena, including game modes like Team Deathmatch and Capture the Flag, but is entirely browser-based. After it entered open beta in February, id mastermind John Carmack said that while most of id's current games have to accommodate consoles, Quake Live "is an opportunity to do something where the PC will really stand alone."
Unfortunately, the game apparently isn't quite as good at generating revenue as it is at letting people shoot each other in the face. Speaking at Quakecon, Carmack assured the audience that the game isn't a failure, nor is it in danger of being closed down, but said it isn't sustainable on ad revenues alone and will therefore require some kind of subcription-based premium service level.
He didn't reveal any specifics about the plan but cheapskates in the crowd need not worry; he also said the game would probably always maintain some form of free service as well.
I played around with Quake Live for several days after the open beta started and found it to be remarkably true to the original Quake 3 Arena. Having a full-blown, "instant on" multiplayer shooter built into a browser is pretty cool and the game looks pretty damn good for being ten years old. But with the good comes the bad: Quake 3 Arena was always kind of half-assed, wasn't it? Still, if you haven't played it yet it's well worth trying, especially while it's still free.