The Google Checkout Blog announced last night that they launched Google Checkout Trends at http://checkout.google.com/trends/.
Last night, I tried it out and it worked well. But this morning, it is not working. I hope to update this post with example searches when it is back and running.
In short, Google Checkout Trends uses Checkout data to show you trends in what people are buying and selling online. It aggregates the sales data from their merchants and plots the revenue (price x quantity sold) over a time chart.
Currently all results return "do not have enough search volume to show graphs."
Forum discussion at Search Engine Watch Forums.

Comments:
Tim Cohn
01/11/2008 03:02 pm
Apparently its still not ready for prime time - doesn't work over here either.
Jonathan Dingman
01/11/2008 06:56 pm
I tried it, worked fine for me.
Patrick
01/15/2008 12:51 pm
The y-axis data is gone - and you can no longer adjust trends for price ranges.