Yahoo Mail is based on Oddpost, which is the granddaddy of sweet AJAX web 2.0 apps. Not only is Oddpost not far removed from today's web apps, it's generally a

Yahoo Mail is based on Oddpost, which is the granddaddy of sweet AJAX web 2.0 apps. Not only is Oddpost not far removed from today's web apps, it's generally a key source of inspiration for many of the AJAX techniques used today.