I don’t exactly know how or why Google sometimes creates nice little screen shots of Web home pages, but it created one for my Alex Catalogue of Electronic Texts. I’ve seen them for other sites on the Web, and some of them even contain search boxes.
I wish I could get Google to make one of these for a greater number of my sites, and I wish I could get the Google Search Appliance to do the same. It is a nifty feature, to say the least.