Very nicely presented. All data sources are legitimate.

Same data as the John Hopkins website but with better visualization.

Extremely well made visualization of airline crashes.

I saw a presentation made with this tool today. I've been using PowerPoint a little more than I care to admit and I like the non-linear approach this uses. PowerPoint has the whole de-facto standard thing going for it though.

Incredible map, made using GPS data from Foursquare. The big white light in Mexico City is 50% check-ins from my brother.

This is really beautiful: select a country, and it visually shows you its relationships with other countries, quantified via Facebook's gigantic data set.

Very nice utility to help you visualize what's taking up space in your hard drive. If you are running low on space, use this before you start deleting 1 KB large files.