There have been a few great ones. Quite a few people fell for the one where he said he was purchasing GardenWeb.
One year Dave announced the Davex Garden Box that was a "new computing system running a special flavour of Linux that we are calling "Davex". The box will retail for $399 (without monitor) and will be a computer with one purpose in life: using DG."
Another year he said that DG would be having the world's first holographic chat room - the HoloChat. That one came with a long post of scientific gobbly gook (sorry Dave!) about electrons and a line drawing of his 'proposal'.
