With the 0.7.0 snapshot, the vpn plugins don't seem to work. Configuring a vpn doesn't make it then show up in the menu of available vpn connections.
actually even worse: Settings saved with NetworkManager-0.7.0-0.1.svn2736.fc8 are completly broken it seems. Actually the above version is the last one that still works with vpnc for me. Reverting to above version made the settings work again.
vpnc-based stuff should now work correctly as long as you restart the applet to notice new VPN connections. Should have that last bit fixed by F8.