If you use Google Chrome as your web browser, right click on the address bar, and choose “Edit Search Engines”. You’ll discover that every web site you’ve ever been to with a search box, including this blog, installed as a “Search Engine”. And you can search that site by typing the domain name (like blog.xcski.com) followed by a space followed by your search terms. (I haven’t tested to see if “Clear Browsing History” clears this as well, but if it doesn’t, that might be a surprise if you think you’ve cleared your tracks)
But another interesting use of this is that you can change the short cut. So if I double click on the entry for Wikipedia, and change the “Keyword” from “en.wikipedia.org” to “wiki”, I can search Wikipedia by typing command-L to highlight the current address in the address bar, then typing “wiki Stephen Fry” and hitting return, and going directly to the Wikipedia page about Stephen Fry.
Lifehacker has an article about some other ways you can use this Search Engine capability to be able to do things like enter a Google Calendar event from the address bar.