I know that the machine that was hosting openclipart.org and various other resources went down about 2 weeks ago, but I thought that it was back up?
Anyway the error responce has changed 3 times since it first went down
cannot find g???.freeedesktop.org -> some wikis at freedesktop.org are experincing problems -> cannot find g???.freeedesktop.org -> now, when it just times out ;-(
if it helps, I am on WinXP, using FF2 and based in the UK
Openclipart.org is running again.