I don't see one on CCO but I would venture to say that something is in the works. If not it should be. In the meantime, given your aversion to MS why not try the moviam client at www.certicom.com It works fine with our concentrator.
Just my guess, let me know if I am wrong, I think the M$ VPN Client is kind of L2TP or PPTP connection, not a pure IPSec client. My department just has one iPAQ for Softphone IPPhone testing through the Wireless connection. Will give it a try for the VPN Client.