Jason Kottke from Kottke.org originally had this idea, but his mockups didn't really do it for me. Until this one great example came up.
I was recently searching for new channels for Sherlock 3 and found one for Google. It's actually pretty cool in that you can customize the Google search without having to go to another page, you can search Groups (Deja) or News without going to another page. It's available at
http://www.sherlockers.com/channels....=searchengines. Wouldn't it be too cool if Apple could integrate this functionality so typing something in the Google bar brought up the Google channel from Sherlock, but integrated right into the browser window?
Instead of petitioning for tabbed windows, I think this could be true innovation for browsing!
Anyway, it's late and I should be sleeping but I wanted to get people's thoughts on this.