Kame homepage, with FAQ
NetBSD's IPSec FAQ
Ghislaine's post explaining some interop peculiarities
Itojun's Kame-Openswan interop tips (PSK)
Ghislaine Labouret's French page with links to matching Openswan and Kame configs (RSA)
Markus Wernig's HOWTO (X.509, BSD gateway)
Frodo's Kame-Openswan interop (X.509)
Kame as a WAVEsec client.