A company called Elastic Path Software has released a single page checkout technology. Most e-commerce sites lead online shoppers through a sequence of pages to complete a purchase. This framework supposedly uses AJAX to consolidate the sequence into one page.
I haven't seen a site that uses the technology, so I don't know if it really improves the user experience. But how would we measure the improvement in user experience? Are the standard usability metrics enough to capture any purported improvement?