Stats on freemium services
patio11: Google for SXSW Webapp Autopsy.  (Oh, heck, I'll do it for you.  http://www.readwriteweb.com/archives/sxsw_web_app_autopsy.ph... )  There is a lot of good in there.Personally I think the data is of limited use even for benchmarking but, eh, your funeral.  Users of my downloadable app convert to the paid version at about 1.8%~2.2% most months.  There is a bit of guesswork involved there as counting downloads is not quite as reliable as "select count(*) from accounts;" .