I think it's a cool idea. What would be even cooler would be if it would do a content based search of your browser history, and suggest the most relevant pages

I think it's a cool idea. What would be even cooler would be if it would do a content based search of your browser history, and suggest the most relevant pages for the thing you want to link. So, ideally it would be finding the pages you actually looked at. (Although, in practice it becomes difficult when you use all kinds of different devices to browse with, plus whether there's enough information to search with to retrieve the page. But I imagine something could be thrown together that does work a decent percentage of the time.)