A long time ago I came across Sippey's blogsnaps, and
noted it as something which would be good to automate. Earlier
today
brad posted a quick way to take a
screenshot of a webpage, and it was pretty straightforward to
expand it in
The result is webshot, which requires ImageMagick and Xvnc. If someone has a better idea how to do what I ended up using xwininfo for, I'm all ears.
Have some sample output: slashdot, my LiveJournal, nyxie's LiveJournal, a Google search.