Interesting to note what is now blocked by Schoolzone's filtering system. All blogs, including this one, are deemed unsuitable. Sure it can be unblocked by the administrator, but in many schools that is a difficult process. Blogs are an excellent educational tool if used wisely and to block them all seems a little over the top.
I also wonder why when the new filtering categories were introduced they were all blocked by default - surely it could have been left to administrators to decide which of the new categories they wanted to block.
Update: I e-mailed Schoolzone and got them to unblock this blog which they did on the same day. I still think that blocking all blogs by default is taking it a bit too far.