Swivel- YouTube for Data (well as close as data’s likely to get anyway)
This is a perfect tool for teachers. Upload your own data sets and correlate away. You can now analyze your data and the data uploaded by other site members (currently all data is public). Once you’ve got things set up, Swivel then creates the html to allow you to easily embed different flavors of the graph in your blog or web site (that’s one of their’s above- and it allows a lot of customization).
It makes data look good and it’s really easy to embed in blogs or webpages. The possible uses in History, English, Science and Math are pretty obvious. But it’d also be a great way to communicate with parents at a school or district level. Testing data will be public anyway so you might as well make it look good and the ability to compare different data sets visually and to share them is simply amazing.
Between this site and DabbleDB I see it becoming a lot easier for teachers to really integrate powerful data analyzation and manipulation into the day to day operation of their classrooms.