About the project
The Trusted Debian project aims to create a highly secure but usable Linux platform. To accomplish this, the project will use currently available security solutions for Linux (like kernel patches, compiler patches, security related programs and techniques) and knit these together to a highly secure Linux platform.

The current release is the v0.9.1 beta release. This Trusted Debian release can be used for:

Virtual Private Networks (VPNs) over the Internet
Secure Wireless LAN communication
Internet and intranet servers
Firewalls (it includes transparent proxying)
Intrusion Detection Systems (IDS)
WWW caching proxy server
Some other server related purposes
More here: http://www.trusteddebian.org/