Amarain-- You're welcome. Actually, the four of them don't ALWAYS sleep together. I don't think it's because of immorality though. ;-). Larry and Curly (the black ones) are brothers, and absolutely inseparable. I have to take both to the vet at the same time; otherwise, they simply spaz out. They haven't been separated since they were kittens, and I seriously think it would be bad for their health if they did. They always sleep together. Sometimes, they both cuddle together on top of my computer monitor, which is simply so cute that I sometimes have to ask them to tone it down a bit.
The other two are the Orange one (Spot) and the white one with a black spot (Nala). Those two are fairly close too. One rarely sleeps without the other. However, it's quite common for orange/white to be in one part of my apartment, with black/black being at another part. I don't really have four cats; I have two sets of two cats. It's weird.
buster-- LOL. And yeah, Kevin Drum is awesome. I don't always agree with his politics, but he's smart and honest.
Sara: Going from the second picture:
Bottom left is Larry.
Above his 'shoulder' and to the right is Curly. Curly has a bigger patch of white on his neck, plus his face and eyes are rounder; that's not evident from this picture, though.
Above him, the Orange one is Spot. Spot, Larry, and Curly are the males.
Nala is the only girl; she's the remaining white/black cat. Nala's also the only one dense enough not to understand "HEY! LOOK OVER HERE!" means, "Let the camera see your face so I can post it on LSD......"