I am probably the LAST person in the world to notice this...
On the top right of Craigslist, you can click 'SHOW IMAGES' and thumbnails will appear in the search screen. (Hover your mouse over the thumbnail to enlarge photo) To get rid of the images, you then click 'HIDE IMAGES'
Did you know about this? I think its BRILLIANT. Please don't tell me it has been there all along, because that would be devastating (not really, but still)!
ps. I have been poking around Craigslist, looking for a coffee table for the basement, but I can't decide exactly what I want, so of course, I haven't found anything yet!