I don't know if it's really a top 10 project, but it gets lots of hits, accesses and mail traffic. Nice! I'm willing to bet it's the cool logo that's the source of its popularity.
BTW, I'm giving a talk on AppFuse at Denver's No Fluff Just Stuff in two weeks. If I can finish up the "appgen" tool by then, the talk could be a lot more fun as the demo would be short and sweet. I doubt it'll happen though. I'm knee deep in creating a version of AppFuse Light that showcases how to use Spring with Hibernate and your choice of web framework: Struts, Spring, WebWork, Tapestry or JSF. I hope to release it sometime this weekend or early next week. Next week (and likely the week after), I have to write Chapter 10 of Spring Live. That leaves almost no time for creating the next cool tool. Who knows though - it might be easier than I think - especially since Lance submitted a good start.