Zip Lookup is a nice use of the Esri mapping platform. The map allows you to enter any US zip code to discover demographic data about that area. Whenever I see something like this I am skeptical of how well it will work for very small towns like the one that I live in (Woodstock, Maine). I was pleasantly surprised to find that Zip Lookup was quite accurate. In fact, it even included a blurb about the most popular satellite television stations in my zip code (my zip code is actually shared with a town, a village, and an unorganized township).
Applications for Education
Zip Lookup could be a neat tool for students to use to discover how people in other parts of their counties, states, or country live. A short research activity based on Zip Lookup would be to investigate what draws people of a particular demographic to an area.