As an experiment, we are making it so that people can post comments without having an account. As we mentioned, we've had problems with vandals and spammers in past projects. So if we start to see any of that, anonymous posting goes away again. Otherwise, enjoy.
Note: Like Slashdot, if you do post without registering, your name will come up as Anonymous, so you can put whatever name you want at the bottom of your post. If we see a lot of people doing this, we can modify the code so that it lets you put your own name in there, even if you're posting anonymously. We'll see.