When browsing or searching in any category in Craigslist, thumbnails of images in the ads are shown below each individual listing. When you move your mouse over the link to an individual ad, you can preview the text of the ad. The images below explain the feature.
Craigslist without Ziink Surfer.
Craigslist with Ziink Surfer.
Move the mouse over an image thumbnail to preview a larger sized image.
Move the mouse over a link to preview the content of the ad.