I use.. oh.. here it comes...................
Nothing.
Well, I use some Checkpoint VPN-1 for Tunneling in for one of my mail accounts, but that doesn't really count.
Strong Believer of security on the network, nuts to desktop solutions.
That being said, I currently use ISA 2006 with plans to implement a PIX (in addition) for my network.
Not to mention the PAT (Although not technically a security feature, it does help.).
VLANs help too. Mmm, Layer 3 Switching gotta love it. Silly packets trying to navigate my network. Eat ACL!
Yup. I believe in complex home networks. Pure Quality! (I wish.. need money.. or free gear. Willing to work for Catalyst 6500 or GSX 12000).