The sheer weight of spam being directed at RPS has proven to be too much. We've now moved over to comments being available for registered users only. We never wanted to have to do this, but the forces of evil were too strong. Sorry. Please register.
Try logging in and out again to deal with the peculiar "posting too quickly" bug. It should not appear again once you have done that. If it does, tell me.
UPDATE: For those wondering about spam still appearing, yes, it can still turn up because spammers can register manually and set their bots a-spammin'. It is, however, much easier for us to clear up like this, and there is also the added bonus that spam-o-tron won't spam legitimate comments.