The infamous "5-step-plan" was, AFAIK, mentioned by some Nokia-guy when the N810 was introduced. I find a lot of references to this on google, but I don't find the original source: Who said it? When? And what was the exact wording? did it really count the N810 as "step 3" (with N800 being step 2) although both devices are almost identical both hardware- and software-wise?