Mods. Or, to be precise, probably just me and sometimes George. I was always in favour of building a community system around DP and if I'd been a bit more on the ball with that it might have been worthwhile, but now user-content is such big business we'd be competing with too many other sources, and besides with the miniscule userbase we have at the moment it's just not worth the hassle of trying to do the security and infrastructure properly. Much more effective to just provide a simple, decent-quality flash site with our trademark high-quality community attached to it like a particularly witty moray eel.
Of course, an informal submission system, i.e. you guys post shit on the forum and I steal it for the main site, would be no trouble at all, and something I'd try to encourage.