Enjoy! http://www.searchenginejournal.com/quickly-find-out-which-search-results-page-you-are-at/13909/
Wow I use Greasemonkey plugin for some blackhat purpose. I never thought of this! thanks for sharing.
Great Plug in, I had use webmaster tool for the same purpose but this is owsome and quick, thank for posting it,
A great site that does the same thing and doesn't require any 3rd party plugins/tools to download is: http://www.seoserp.com/web_tools/google_top_1000_serps_checker.asp