Samizdata - 9:52 pm on May 21, 2011 (gmt 0)
I can change the URL to a more inviting page for people to see in the search results
Technically simple to do, but it invites retribution from Google who indicated via their belatedly-launched FAQ that doing so "may cause your site to be perceived as deceptive and removed from the Google index".
Before that I was serving a splendid generic preview image for one of my sites.
All the text on it was very readable (as intended).
Google obviously could not allow this to continue as it was so open to abuse.