Incomprehensible? Moi?

I’m not quite as “longwinded and incomprehensible” as James, it seems:

I’m not sure exactly how useful this little tool is. Not only does it not give any indication of exactly how your ‘readability’ is calculated, but it also seems to be a little bit indecisive: when I tried it before the last post went up, it claimed that I was writing at the undergraduate level (I presume it just scans the front page, so this post will probably change it again). But it does raise an interesting issue: my main motivation in writing this blog is to make science more accessible, which means presenting information in terms that the non-expert can understand. If this thing is right, I may not be succeeding.
So, some questions for you lot: what level of education do you have? Science or non-science? How much of what I write do you actually understand? Feedback (particularly from lurkers) would be appreciated.