Yojimbo includes a feature that allows you to sync your items between computers via .Mac. .Mac users are used to this kind of convenience with their Safari bookmarks, calendars and keychains, but now it’s open to any developer to use for their own data. Although technically different, it’s effectively IMAP for your data.
This is a really interesting trend to me and it will, I think, start to emerge as a killer feature for both the applications that implement it and for .Mac itself. Apple’s online service really struggles when compared to free mail services like Gmail or low-cost services like Strongspace, but nobody has a sync solution like this.
Somewhere in the back of my mind, I’m wondering what kind of a world .Mac Sync could open for wi-fi enabled handheld devices, but that’s another post for another time.