The Tesco API gives you access to the vast grocery catalog of the third largest retailer in the world. Tesco's Grocery API has the ability to allow you to search for products using text or barcode, by dept/aisle/shelf categories, all special offers, and even previously bought 'favourites'. You can add/amend/delete items in the basket.
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Just to be clear the API is still available you just cannot register for a new account at the moment. If you registered for a key when it first got released you can apply to have your key re-activated and you will be able to use the API.
I written an article on consuming the API: http://www.ifc0nfig.com/exposing-the-tesco-api/ for the PRODUCTSEARCH method. May be of use :-)