Stephen Downes

One of the major limitations of web browsers has always been cross-site scripting: that is, using Javascript from one site to manipulate and display data from another site. This was because allowing cross-site scripting would create a big security hole (for example, one site might read another's cookies). But Firefox 3, which is in development, will implement the W3C's Cross-Site HTTP Request protocol, which will make (secure) cross-site scripting possible. Via Simon Willison, and more here.