No. All the content on the site, including comments are free to be viewed. None of the published content is secret.
When you try to create an account, the last field you must fill in is called CAPTCHA. This field consists of some squiggly words or numbers and you're asked to type in what you see. The purpose of this is to ensure that an actual human is trying to register.
A computer trying to automatically sign up in order to spam the site users, can't actually interpret the squiggly words and so can't create an account.
We hope to add forums and blogging in the near future.
We're also open to requests and interesting suggestions. Please contact us via the contact link at the top of the page to make some.If we allowed the world at large to comment on things without registering, we'd be exposing ourselves -- and our users -- to spammers.
In addition, we would like to help create a sense of community online and you can't have a community if everyone is anonymous.