This is a realy nice way of looking deeper into google and may give an idea of what the google may look like in the future.
To try this out
1 goto www.google.co.uk
2 paste this into the address bar
3 hit return
Ignore any error message
4 now do a search
You can see now an extra bar on the left which shows at a glance you the search relevance in the other categories origionaly thease where at the top of the page and did not show any relevancy.
Google insiders have said that Post Big Daddy there would be more changes maybe this is a hint at what they may look like?
You can find more information here