Danny called out Google for indexing their own product search results on April 30th. Since then Google updated their robots.txt file to include an exclusion of /products?.
A German forum, ABAKUS Forum (remember Alan Webb?) spotted Google displaying Google Product results for the search term wireless router.
The result is on the first page, 9th result:
As you can see, there is very little information indexed for this result. But I assume the linkage data has pushed it to the first page of the results.
Hat tip to Stefan for spotting this and sending it to me. Forum discussion at ABAKUS German Forum.