Microblogger allows you to post quick comments to your readers, without need for an account (as the twitter etc plugins do) - even from your mobile!
Please tell me! This is a long term bug that appears sporadicly, I would be very grateful if you could drop a post on the comments part of the page on my blog with the exact error message. That way I'll stand more chance of being able to actually fix this. EDIT: I think the problem is solved, but don't quote me, confirmed later.
An email would be great thanks (firstname.lastname@example.org), failing that the comments section of the microblog page of my blog would be great - thanks again!