Anyone interested in using the NXT in the classroom will enjoy exploring this program at Wichita State University. The education and engineering schools are working together to provide teachers with both the knowledge and the tools to use the NXT productively in their classrooms.
The challenges for the 2008 robotics competition at Wichita State can be found here: http://wichita.edu/shockermindstorms.
If you are a teacher in Kansas, note that there is a significant grant program to support your use of NXT in the classroom. (http://tinyurl.com/32ch7q)
Do you know of another great program? If so, tell us about it.