First impressions: Very positive Dropbox will probably take over gmail as my primary file storage on the go... ;) Now, one question though, is Dropbox smart e

First impressions: Very positive Dropbox will probably take over gmail as my primary file storage on the go... ;) Now, one question though, is Dropbox smart enough to only access network when I am actually doing anything with it(ie transfering files from/to Dropbox), or will it occasionally do weird sync type of things even when I am not using it(but have Dropbox folder open on desktop)?