Vimium - the hacker's browser
Vimperator for Firefox does the same. 
<a href="http://vimperator.org/vimperator" rel="nofollow">http://vimperator.org/vimperator</a><p>One hint: have an alternate browser for normal users to use when they borrow their laptop for a second. Because not having an address bar or any icons or tabs tends to confuse them :)