Okay ... here is a new wrinkle ... SugarSync.com
I started playing with it last week. It does a great job of syncing the OmniFocus and Bento databases (as well as the rest of my files) It comes with a price though. $5 a month for 30 gigs. It keeps things synced with my MacBook Air, Office PC, and MacBook Pro however with no issue.
As to OmniFocus I've relocated my database to the Documents folder, although that is really not necessary and actually part of my prior chronosync workflow. Now everytime the file changes, SugarSync puts it up to the cloud and down to my other mac just about as fast as I can walk across the room to the other machine.
I haven't decided whether I'm going to commit to pay the $5 per month but right now it is really tempting.
David
www.macsparky.com