The most recent packages from Nokius can be found here:
I use them to connect my Xperia 10plus (firmware 3.4) with vpnc to an FritzBox. They are working fine for me. The description mentioned above on sailfimods.de is for an old version of the gui. The packages seem to be updated for 3.4 now. The previous package for 3.3 was working too, but always lost parts of the configuration after being used. Saving the PSK or authentication was not working. With the version from November 23. I can simply reconnect to my FritzBox and everything is working fine.