DeAnonymizer is a leak-test tool for privacy implementations, designed by XeroBank and Janus Privacy for Privacy Research International. DeAnonymizer is unlike other testing tools such as browser information enumerators, as we research and develop methods to actively test the browsers security in regards to anonymity. DeAnonymizer is not specific to a single privacy service or network, and will equally test against any privacy service including web proxies, SSL tunnels, Tor, JAP, and VPNs.

Other privacy and anonymity checks worth checking out are:
BrowserSpy - Massive detection of browser information
Decloak.net - Checks Flash, Java, QT, and ITunes.
Master Reconnaissance Tool - Lots of info about your browser.