There is something wrong with the comments on my blog at the moment - I've had reports of people not being able to comment. I am looking into this and will try and get something sorted out - there is a new version of the blog software I'm using so I'll upgrade to that shortly.
If you do want to send me a comment in the meantime please use the contact button up at the top-left and send me one that way - I'll make sure it gets put on the correct post (if you tell me what post it belongs to).