Little Snitch Shareware
1.0.2 Internet
Objetive Development $24.95
littlesnitch@obdev.at OS X
http://www.obdev.at/products/littlesnitch/index.html
Little Snitch will intercept any attempted internet connection and bring up an alert panel, telling you all the connection details, including the name of the application that initiated the connection. You can either choose to allow the connection, to deny it, or to add a permanent rule for future similar connections. Secure your connection from trojans, worms, and other network parasites.