If you or your students do any work with data sets and spreadsheets you should take a look at Widgenie. Widgenie provides a set of tools that allows you to easily take data from a spreadsheet and turn it into bar charts, pie charts, line charts, area charts, and tabular charts. You can import data from Excel spreadsheets, Google spreadsheets, or any CSV file. If you just want to test out Widgenie you can use their sample data sets.

Applications for Education
Widgenie could be a good tool for students who need to make visual representations of data that they have collected. Students can share their Widgenie charts in your classroom blog, wiki, or use them as visual aids in oral presentations.

Here are some related resources that may be of interest to you:
iCharts – Create Interactive Charts Online
Flashcards and Word Searches Using Google Spreadsheets