Sync docs between PC and Droid

[Lake]

How do I sync Word and Excel docs between my PC and Droid so that when I change them on either machine that they will sync and show final doc on both machines. i could do this with my palm centro with Docs to go, but that does not seem to exist for Droid? I only see how to open and change on my Droid, but not how to sync?
Any suggestions.
Thanks