Absolutely brilliant idea from the people at Mozilla (the company that makes Firefox). They've put together a cunning programme that will take individual websites and make them have their own window.
What's the point?
Basically it makes webapps better by removing the browser 'clutter' at the top which makes the whole thing look like a webpage. The plan is that you won't be able to tell the difference between using Google Docs and using MS Word or something like that.
When this is finished, expect to see it become an integral part of Google pack. It'll work with other software too, I'm sure Zoho will be all over it too. This Web 3.0 that everyone's talking about may actually be Desktop 2.0. Let's make a buzzword generator to cover it all off...