Hmmm, hmmm and more hmmm. IE6.0 SP1 gets a different version of BloggerBasic. So if this is on purpose, Pyra Labs and Google consider IE6.0 to be the pinnacle of modern browser development. Which is complete shite, since IE6.0 - as observed recently - is getting long in the tooth in browser terms. IE6.0 SP1 isn't a bad browser; at least not compared with, say, Netscape 4.x... but it sure as hell isn't a good browser.
Sadly it seems they have decided to favour "popular" over "good".
Small mercies: the B and I buttons now insert STRONG and EM instead of B and I. This is a Good Thing.
Plus it does seem faster.