Haven't been here in quite a while, but I hope I'm not too late.
It's not really a site, it's a forum since we never had the need for a snazzy website. Personally it's as organized as can be but there's a lot to it so I see what you mean.

Since you've been having a bit of trouble finding the download links, I'll post the important ones here.
MKF v0.4: http://www.sendspace.com/file/vde5by
0.41 patch (includes previous fixes since 0.4, extract to the game folder): http://www.sendspace.com/file/9rg5p0
SMFR v0.1 (doesn't include the Diamondus level yet as the respective world isn't ready): http://www.mediafire.com/?mvjmzxwjjmm

Recently I've been assigned as an MKF Beta Tester, unfortunately I haven't had the patience to come back there (and here) since this August.
To be honest I'm lazy and frequently uninspired, so it takes a lot to boot myself up back to shape. But on the other hand, I've been trying the Alien Swarm SDK (you probably heard about it by now) so I'm learning the ropes of 3d level making as well; last time I did that was with Sauerbraten.
Hopefully I'll get something done in the meantime.