Google Search Focus : Greasemonkey UserScripts
One thing about Google search that irritates me is that the search input box don't have accesskey attribute. Once I do a search, the only way to focus the search input field is to grab the mouse - and I hate that. This script only works on google search result pages(SERPs). If you press 'Alt+s' in a result page, the search text input field will be focused. Very useful if you want to refine your search.