It looks as though the PSN outage is also keeping folks from posting comments on the PS Blogs.
According to a post over on the EU PS Blog, users have to log into the site using their PSN ID in order to comment, but since cookies are only stored for the site for around a week, there are issues when it comes to posting.
Here's what the site had to say on the matter:
We are aware that you may no longer be able to log-in to the PlayStation.Blog and leave comments. This is because every time you log-in using your PlayStation Network ID, a cookie is created to keep you logged in for one week. These cookies have now started to expire and you will not be able to log back in until PSN has been restored.
Basically, you can still read the Blog without logging in, you just can't comment.
Sony has estimated that PSN would be back up within a week, and in the meantime, there are loads of Twitter accounts you can send questions to listed through the link.