Hamachi

Ian found this originally, but my pen-testing cousin just send me the link as well. p2p VPN, w00t. Hamachi is a VPN alternative that does not have the normal router problems associated with IPSEC and PPTP vpns. That is good because of firewalls and nat and things like that. (Even though I don’t think PPTP has huge problems with VPNs, since it is based off PPP).
http://www.hamachi.cc/