F5 Firepass VPN and safari
Prior to Snow Leopard if worked fine with Safari 4.0. After Snow Leopard the plugin will attempt to load and ask to be reinstalled. Even after a manual installation of a fresh copy of the "F5 SSL VPN Plugin.plugin" and restarting Safari it will ask you to reload the plugin again.
My work around was to launch the plugin from firefox. Firefox will launch the plugin and I revert back to Safari for browsing my my office network.
PowerMac Pro, Mac OS X (10.6)