Pics and slightly more information: http://www.reddit.com/r/gaming/comments/m32us/official_steam_forums_hacked_the_forums_were
The email that's apparently been sent out to the accounts:
Ever wanted to dominate the servers you play on with guaranteed results, but you were too afraid to cheat because of ban risks? Visit removed domain It's safe, secure and undetected.
Along with hacks, we've also got some general discussion sections, hacking tutorials and tools, porn, free giveaways and much more. This site has been conditioned to meet all your needs in terms of resources so be sure to take a look and tell us what you think.
the fkn0wned team.
Fkn0wned apparently is not taking responsibility: "In lights of someone crediting us for the recent breaches of steam forums, the board is offline. Fkn0wned is not responsible."