A few days ago Google migrated Products search to the forefront replacing Video search on the Google search pages.
People started asking questions, turns out many saw Products search for the first time.
Here's a few interactive visual aids, "What is" and "How to's". Enjoy!

explanation of the main Products screen
web20ref.com/r/RGScGprod.html

results screen explained
web20ref.com/r/RGScGprodRes.ht ...

"what you can do with the feature" major walk-throughs
web20ref.com/h1/hshop.html