It's been down for a long time, maybe close to a year. I can't say when it will be back up -- there was a bunch of code that was incompatible with changes made to PHP, so I would have to either (a) fix all those bugs or (b) implement the site using a proper web framework so I'm isolated from these types of things in the future. (b) is my preference, but I've had no time to devote to it recently. I did pay to extend the domain registration for another year so it's definitely something I want to do, but I can't say when that will be.
Sorry about that -- I know you were one of the big uploaders, so if you're in a real jam, I could probably export the data directly out of the database for you and give you a dump of it -- you'd obviously have to script your way to happiness using that output, but it's an option until I get the site back up.