Funny .. I was doing a basic search for something and the main google search results came up like this
sponsored links in normal areas googlebase stuff link to (product results) results available through google checkout. Prefer the classic view? (link)Don't categorize results.
stores (3) in a sub section with link to more stores news (2) in a sub section with link to more manufacturers (2) in a sub section with link to more References (2) in a sub section with link to more Reviews (2) in a sub section with link to more
at the bottom ... More Categories for (search string):forums, blogs, comparison shopping
Very interesting. If Google offered search results in this format on a permanent basis then it would shake up the SERPs a huge amount. In Bewenched's example you would need to be in the top 3 stores to appear on the first page (barring Google base/checkout results). Of course if you offered news and reviews on your site then you may appear lower down the page as well as or instead of appearing as a store.