Hi Shanks,
A great subject ! Proof is the copious echo you already got. I wonder if we actually know whether we speak in sentences most of the time? Because we can't review our utterings before they are broadcast, and often forget the beginning when we reach the end . One occasion when everybody notices this is when speaking to an answering machine on the 'phone: how often do you prepare those sentences in advance? e-mails are a truly new type of hybrid between the spoken and the written word.