html5 and other semantic enrichment of default article and add to cart markup

[agitator]

does anyone know of any best practices for optimized markup of the addtocart-viewlet?
especially the item infos as price, availability, ...

[agitator]

stumbled accross
http://peteschuster.com/2012/05/semantic-html5-for-products-in-ecommerce/
http://schema.org/Product

opinions?