I find the search within a website function on the Google toolbar, especially useful.
I don't like the way that Google has been censoring certain results and images that it deems are not flattering to Obama.
For example, if you use Google Image search, you cannot find this image of Obama where he looks like a ridiculous pimp smoking a joint:
It cannot be found at all using Google Image Search.
On the other hand, you can find it on the first try using All The Web's Image Search.
source: http://www.time.com/time/photogallery/0,29307,1866765_1815160,00.html
(sorry, but i found it using google)