He mentions pfSense and though it's sort of tangential, I have used pfSense on a Netgate device for years and years and been very happy with its performance. Highly recommended.
Netgates are nice, but not cheap. What do you do when you want to run FreeBSD on a $50 wifi router you have laying around?
Not $50 and you probably don't already own one, but it can be done on the Uniquiti EdgeRouter Lite ($100, runs Debian MIPS + Vyatta as the default officially-supported Ubiquiti image but very hackable): http://rtfm.net/FreeBSD/ERL/
to get the performance people are constantly raving about, you need the very proprietary binary blobs that take full advantage of the Cavium hardware acceleration.
otherwise it's just another beefy MIPS machine.
Yes, this is an important bit of subtext that most people don't realize.