Books For The Future collects used books and sells them online. For every book sold they plant a tree. The site will soon have 30,000 products. Products are entered by scanning or entering an ISBN barcode. If a number in not available a title/author search is used. It searches Amazon for related titles. A title/ASIN is chosen, condition category and notes, and locator code are entered. The site automatically pulls information from amazon to set the price, author, description, dimensions, weight, and other related product fields. SKU's are auto incremented for the most part. Images are downloaded from Amazon and inserted into the image field. Products are then automatically uploaded to Amazon, ABE books, Alibris, eBay, and Half. When an order is placed on another market the website downloads the order and creates a local ubercart order. Inventory quantities are updated across all the markets. We still have a ton of work to do, but the site is "live".
We use Views Fast Search on the main page and elsewhere http://drupal.org/project/views_fastsearch
With 50-100 orders per day we needed a printable list of products to pull. We added a Views filter for order status to help create the table and use a simple print.css file for formating.
I'll have information available on the integration modules in the next month or so.