I was reading thru the wiki earlier today, the address bar google search page was actually what got thinking about quick/keyword search. I'm wondering about the opera/firefox feature which allows you to right-click on a search field and create a special bookmark to the search 'engine' and designate a keyword(letter) to go along with it. There was no limit to how many youu could set up. It was really great tool!

http://www.mozilla.org/products/firefox/smart-keywords.html