loadsfromamazon is an ActiveRecord Mixin that works with the Ruby/Amazon library to let you populate an ActiveRecord object with the details of a product listed on amazon. In the README I use the following example:

class Book < ActiveRecord::Base
  acts_as_amazon
  maps_to_amazon_attribute :authorlist => 'authors', :combine => ';'
  maps_to_amazon_attribute :title => 'product_name'
  maps_to_amazon_attribute :isbn => 'asin'
  maps_to_amazon_attribute :publisher => 'manufacturer'
  maps_to_amazon_attribute :pubdate => 'release_date'
end

@book = Book.load_from_amazon(isbn) # Loads but does not save
@otherbook = Book.load_from_amazon!(other_isbn) # Loads data and saves to database