The Gmail approach doesn't interest me, but a method using Amazon product lists and a search with autocomplete and images (to help me identify the products I don't know in detail) would be more useful.

Haven't tried your product as a result of the Gmail thing so I'm not sure if you already do this, but you could prompt people with things like:

What model fridge do you have? (Delete - I don't have a fridge) Washing machine Microwave etc