dstiles - 9:49 pm on Nov 10, 2010 (gmt 0)
I block the preview bot (just checked and it gets a 403).
So, since I'm blocking the preview bot the info is coming from googlebot.
One of our client sites (at least) looks terrible: we've blocked furniture images from google in robots.txt (for most of our sites, in fact) so only the text is shown. I would not click on the page so doubtless the site will suffer.
On the other hand... one of our own sites blocks both img (furniture) and pics (topic photos) and the whole site is displayed IN FULL! So someone is disobeying robots.txt (and yes, it is correct!).