Safari Omnibar is a post on The Hickensian

Safari Omnibar is a SIMBL plugin for Safari that enables a single addressfield/search bar like Google Chrome’s Omnibox. Its still fairly early days, but it works well, and has just been updated to support search shortcuts:

(the search bar is hidden after installation)

To edit keyword searches, right click the address field…

… and then you can then enter the search keywords

This is of course functionality that’s been available in Opera and Firefox, long before Chrome, but this is a great way for folks that prefer Safari to get it.

Safari Omnibar is hosted on github