Athenir. Nick has lots of neat things planned to add to Athenir this summer, but for now it is a search tool. When you enter a search term on Athenir you will get results from Yahoo along with a graphic of related search terms. In that regard it reminded me of Google's, now defunct, Wonder Wheel tool.
Applications for Education
Athenir could be useful to students who are struggling to see connections between search terms and or are need of assistance in changing their search terms.