There is a lot of good potential for libraries here, and I loved some of the examples our instructors gave us. I thought the Hot Titles Carousel and the Barns of Winnebago County particularly good. To really shine at implementing these would seem to take a mixture of creativity and savvy a bit beyond me, nonetheless, I was able to use Mapbuilder to create a Fox Cities Movie Map.
It's not real slick, but it was fun to do and learn a bit. Once I started looking at getting a Google map API to really make it nice, I thought "well, I could do this, but do I really have the time and motivation? Is it worth it?" But if I were really trying to do it for the library web site, it would be.