A user captures an image of a retail product with a smartphone. Product recommendations associated with the retail product are provided to the smartphone. One claim recites a method comprising: receiving first imagery captured by a smartphone camera, the first imagery representing a first retail product located at a retail location, and presenting the first imagery on a screen of the smartphone; providing the first imagery to a processor to produce fingerprint data therefrom, the fingerprint data being utilized to identify the first retail product; receiving second imagery representing a second retail product, identified as a product recommendation associated with the first retail product, the second imagery being sourced from a source different than the smartphone camera; presenting, on the screen of the smartphone, the second imagery; receiving user input via a touch screen of the smartphone; as a consequence of said user input, initiating an action. Of course, a great variety of other claims, features and arrangements are also detailed.