  I've hacked together a little search proxy, urlLink lazysearch.php , out of frustration at Safari's lack of a Mozilla/Camino-style bookmark "keywords" feature. It was also inspired by urlLink a recent entry at MacOSXHints.com . So what does it do? Basically it allows you to enter search queries like "s/foobar" (to search for "foobar" on google) or "s/n/apple" (to search for "apple" on google news) right into the location box of your browser.
Because it's implemented at a system level, it should automatically work in all browsers on your system, unless they are too clever for their own good. This requires that you are comfortable with a little Netinfo and Apache configuration. If you want to customize the script, you'll need to edit strings in the PHP source. I'm definitely looking for feedback and suggestions. Enjoy! urlLink Discuss 
