Today, we (meaning the Mozilla Labs team) are releasing technical documentation of the proposed system and a developer preview prototype that allows you to install, manage and launch Web apps in any modern desktop or mobile browser (Firefox 3.6 and later, Firefox for mobile, Internet Explorer 8, Chrome 6, Safari 5, Opera 10 and WebKit mobile). This prototype provides a simple mechanism to support paid apps and authentication features to allow apps to log users in upon launch. Head over to the Mozilla Blog for all the details and check out the technical documentation and developer previews. I will post more on this soon - so stay tuned. :)