I'd seen Keychain2Go mentioned in the Apple Discussion forums.
I did some searching and Internet reviews sounded good so I downloaded it and read the help files. My understanding from this is that Keychain2Go requires the Keychain's password. Apparently, it decrypts the keychain entries, encrypts them with it's own method and shoves them in a database. It appears to synchronize by comparing two databases over an encrypted channel (on a local network only) and then adding/modifying/deleting from local/remote the Keychain(s) as necessary.
Giving my Keychain password to a 3rd party application makes me nervous. Perhaps I'm paranoid but I'm not comfortable with this.
The search continues.