A Google AdSense blog post from last week was the first time Google told us a number of how many AdSense publishers they have. Google said they have "over one million publishers" in their network.
Google, I believe, has never given a size of their publisher network, outside of revenue earned as reported in their financial reports. But I do not believe they ever told anyone how large, in terms of the number of publishers, the AdSense network is.
A WebmasterWorld thread has some publishers saying they are shocked Google has so many publishers. Honestly, does one million sound like a lot? I am not sure. What do you think?
Forum discussion at WebmasterWorld.