As I've tweeted earlier, our Redis server went unresponsive on us. We're working with Amazon to bring the machine back up (worst case is we'll have to rebuild it), but right now you will probably see some wierd behavior and slower site speeds.
10:30am PST - The server is now back up and running. Forum activity and comments look good and nothing seems to have been lost in the last hour. It'll take awhile for counts to reset, but that is purely caching. Sorry for the inconvenience.