Got an RPi working with the "Wheezy" distro. Since I don't really have a USB keyboard or HDMI tv to spare, I needed a way to set it up headless, which meant it had to be running sshd with a default login/password on first boot. Originally I tried using the Occidentalis distro from Adafruit.com, but for some reason it would refuse ssh connections. I was able to ping the RPi and nmap showed that port 22/ssh was listening, but I couldn't get through. Wheezy worked the first time, so that's what I'm going with.