Last week, Adobe boasted about Unreal Tournament 3 running on the latest version of its popular runtime, Flash Player 11. It was quite an impressive feat and a sign of things to come for web gaming.
But don't think that it's going at it alone. Flash has some solid competition from the open standard WebGL. While WebGL may be evolving slower than what Adobe managed, it's getting there.
Already, we've seen
Quake 2 ported to the web technology. Quake III is also running on WebGL. But those are very old games, an impressive feat, but hardly relevant to today's gamers.
Which is why Team Fortress 2 running in the browser is a much better showcase of what WebGL can do. The Source Engine behind it powers Half Life 2, Left 4 Dead and many other games. Granted, it's only a demo and not everything is working, but the performance is very solid.