Starting in 1996, Alexa Internet has been donating their crawl data to the Internet Archive. Flowing in every day, these data are added to the Wayback Machine after an embargo period.
Valve's Big Numbers: Ever wonder how many copies a big PC game might move? Lifetime Sales of Valve's Big Releases are now available. But what's really interesting are what the numbers don't show, and how digital distribution is changing the industry. Read more! - Fargo