It's been down since the 22nd or 23rd, so it's been a while. Oobles did actually put out a request for someone to take over the site, a bit ago, but there wasn't an official announcement or anything. I could find the post if the forums were still up, lol. The nameservers still work and
http://wiki.ps2dev.org still works which makes it seem the host server isn't working...
Maybe someone on #ps2dev @ irc.freenode.net knows something.