I finally clicked on the ad in Facebook that shows cute shoes from Like.com. I didn't have time to examine the site much today, but it seems to have an interesting concept. It allows you to shop for items visually. So if you see a shoe (or other item) that you kind-of like, but it's not quite what you want, you can isolate the feature you want to search on.

If you know what a D'Orsay shoe style looks like, for example, then you are probably doing all right using text searches on most sites. But if you don't know the particular names for different styles of shoes, then this site is for you--you'll actually be able to look at the details you like, and search for similar items, without getting an advanced degree in shoe terminology.