Looks very useful, since I usually can't remember to tag individual pages, but can usually remember the domain. This would drastically reduce my cognitive load.
That being said, I must be that guy and ask: Will there be a Firefox add-on?
I hope this helps some of you that are like me and horde 10.000 bookmarks, it helps me access sites faster if I already know the domain but need to know the exact subdomain or page.
