Hi David,The english language numbers are way too low, if you just count people who know the rules and have played a few games. The igowin download page has been visited over 60,000 times in the last 6 months. I'm certain there have been at least 100,000 igowin downloads, and most of those people played a least a few games against it.
Do you have a breakdown of download against region however? Maybe many of the downloads are from Japan/Korea? There is also the distortion of people downloading more than once (e.g. a copy for their work machine, or after buying a new machine, etc.).
I'm looking forward to 5-10years from now when the hikaru-no-go fans are: a) swelling the professional ranks; b) at university and interested in computer go research. (assuming someone on this list doesn't solve go before then ;-).
Darren