It's 3 weeks now Does somebody knows what's happening ?

I can't confirm if it was up in previous 3 weeks, but the site appears to be up now - http://openclipart.org/

Openclipart was experiencing scaling issues (it was hosted at freedesktop.org), and is now beeing moved to a new location (osuosl.org). The WIKI page is already working, the rest should be available ASAP.

http://www.openclipart.org is back !!!

[edit] and down again but i'm sure it will be ok soon