No idea. I'll have a look, I know of a forum that uses it.
www (point) elementsforum (dot) co (period) cc if you want to have a look yourself. (ScaredGirl is the admin.)
Random fact: I started that forum - then bottled out when the first troll hit. SG and EvilHamster took it on from there. I don't know what EvilHamster calls himself now, but he dropped out of admining, too.
EDIT: I think you can, but you may have to attach the level to a post, too. If you then rightclick on the attachment link and "copy link location" or similar, you can then use that copied link as a direct download link. It all stays within the boards.
I guess you could use a file uploader elsewhere, then post the download link, but then there's the whole taking-it-down-unexpectedly thing.http://elementsforum.co.cc/index.php/topic,8167.0.html
is the thread where it was introduced on that forum.