I thought I'd have a play with this today, found an old Athlon XP2400 PC and and 2nd network card, I was going to setup on a test network then found while installing it has a tranparent bridging mode so instead I just set it up with a static ip address and put between my network and firewall/server. The modules are a doddle to install, just select the one you want then download, that's it, I didn't need to configure any of them, currently installed is the web filter and blockers for spam, phish, spyware, virus and ads. The admin is all web based which can be done remotely and shows you in real time what it is allowing/blocking.
I would definitely consider using it if I was running a small business with Windows PCs, I may even keep it at home, but as I am mainly Linux I don't really need it.

Very impressed couldn't be much simpler.

Untangle provides an amazing amount of capability even with just the free (open source) modules in use. This latest version is the most complete yet. Requires very little maintenance (much less than most Linux distro packages) and is easy to setup, use, and administer. Highly recommended for home, small, and medium business. Soon may have the redundant capabilities for larger enterprises as well.

With spam, spyware, identity theft (phishing), hacking (the unethical kind), viruses and trojans becoming more and more prevalent on the Internet, folks who want to run more than one computer in their home have to really consider the security benefits of edge devices. Edge devices are computers (either dedicated or appliances) designed to sit between your DSL or Cable modem and your internal network. Edge devices act as a first line of defense, protecting home computers and servers from intrusion and infection. Untangle has released version 4.1 of their amazing firewall distro for edge devices and we have been using it here in the lab for several weeks. What you will see will amaze you.