Jean Mercier has been the unofficial Skype Score Keeper for several years. One of the items he tracks is when the # of Skype users online reaches a new Million Mark. Amazingly it took only 21 calendar days for it to go from 18 Million to 19 Million. In the past it has taken as long as 9 months to jump 1 Million (see Jean’s chart below). I believe business people world wide are discovering Skype as an effective way to reduce international communications costs.