Speaking of VPNs....
My work VPN does not work with my home wireless network, but it does work with (every) other wireless networks...
HOWEVER, if I use my wireless bridge as an access point client and connect my laptop to it, the VPN does work -- using my same home wireless network. Which means the problem isn't the wireless network, router or firewall.
It's just weird, and I've never been able to figure it out, and I'm fairly advanced at this stuff.