Before I've even had the chance to play with Microsoft's Simple Sharing Extensions, Ray Ozzie just shared a prototype they have been playing with internally. Its called Live Clipboard and basiclly is a clipboard for the semantic web.
Its a JavaScript-based solution which works in most browsers like Internet Explorer and Firefox. It stores data on the page as actual xml data trees which can be copied and pasted without having to select the text content. Its a difficult concept to explain but luckly Ray's got tons of screencasts to show how it works. The interesting thing is that not only does Live clipboard work in the browser domain but also in the desktop domain. Thanks to 25hours a day for the Etech trip report, which alerted me to Live clipboard in my RSS reader today.
Honestly when I first read the post, I did think this would be perfect as a Firefox Extension or even Greasemonkey script but you would miss out on the desktop side of things. I'll be interested to know how flexable Live clipboard is. For example will it read all types of Microformats? How about FOAF and XFN? Humm, I wonder if you could do something between a Firefox extension and a Yahoo Widget?