Yes, that's right! Survival multiplayer has just been released and we set up a server for it. You can reach it under the following address:

smp.specialattack.net
or
85.17.102.2
(port 25565; no need to enter) 

SpecialAttack.net Freebuild address changed! Update your bookmarks!
http://www.minecraft.net/play.jsp?server=e39f11c6845a035bf823d0e6fdee7955

Mind you, the server is very, VERY buggy and epically limited in functionality (the config file has three lines, no admins, no anything). Forget about all your epic city building plans - the map will be reset when the mode is slightly more playable, especially considering items currently aren't stored between logins. Treat it as a playround experiment - the true experience will start once creeps are added, then the world will remain permanent.

Remember that you have to BUY the game at http://www.minecraft.net to be able to play Survival. As a side effect of the Survival Server going up, SpecialAttack.net Obsidian was retired, may its soul rest in peace (the server software is half-baked and semi-abandoned).

Also, here's a video of stuff that isn't working correctly on the server and you won't be able to do! Fun isn't it? (Not being able to make it work, that is.)