Protects your applications from undesirable network incoming and outgoing activity, controls applications internet access. Allows you to control personal information leakage via controlling application network traffic.

Features

* Designed for Windows Vista
* Free versions available
* Special editions for portable devices (USB flash/HDD drives, iPod etc)
* Special editions for U3 smart devices
* Protection from incoming and outgoing threats
* Simplicity of operation
* Per-application security settings

Freeware version available
http://www.sphinx-soft.com/Vista/index.html

Excellent (and it's freeware)
Works in conjuction with Windows Firewall
Simple to use
Lets you set up what goes out of your PC
Have used for over 6 month with no problems