The following sites might be helpful to configure IPSec again, or on a more complex basis:
http://www.cisco.com/univercd/cc/td/doc/product/iaabu/pix/pix_60/ipsec/conipsec.htm
http://www.cisco.com/warp/public/707/overload_private.shtml
VPN Starter is a extremley simple dashboard widget for OSX used to connect to Cisco VPNs. Note the huge red button graphic that is impossible to not understand. This is my holy grail for end-user VPN connection programs.
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/