Adam Parikh at Adamap discovered that Google was providing search numbers for keywords in their Adwords Keyword tool. Adam says:
I was doing some research with the Google Adwords keyword tool when I noticed the number of searches next to the previous month's bars indicating the search volume. I had not seen that before, nor have I seen it since. I have heard of Google testing new features on their SERP, but in my experience new features are usually stick around in the AdWords interface and are announced in a timely fashion.
Catch the screenshot.