[roxstar]

Not that I know of but google sync manages it quite well for smartphones (though it is syncing it to a gmail account and not dropbox).

[sayemm]

Yeah I know google sync, but think it would be pretty awesome if I could back that all up across several different platforms via Dropbox, along with all my laptop/work stuff

[lgarron]

Dropbox is a folder dropbox, it's not MobileMe, or WhateverCompanyComprehensiveDataCloudSolution. (Although doesn't Google already do everything but files pretty well?)

[appliedluck]

I don't think I've seen anyone attempt to do it with the Dropbox API and your mobile contacts, but I'm pretty sure it could be done.

[ambirex]

I've been playing with creating a CardDAV server, which is pretty mush shuffling vCard files around. You could probably something similar with Dropbox.

[sayemm]

Yup, that's what I'm thinking... I think it would be cool to hack something up like that.