I probably shouldn't say this, but I'm impressed by how much trouble they're not. I've never met kittens who didn't chew things up, shred them, steal things and hide them, or otherwise cause all manner of mayhem.
He's becoming very affectionate, and she's slowly becoming less skittish. They both tend to come hang out near my desk when I'm at the computer, and he'll meow at me and demand attention. That's pretty good progress for one month!
It's about time to take them to the vet and get them fixed, though. I should also figure out how old they are, since I have some conflicting information.