Orkut Scrapbook Searcher Extension for firefox adds a search box inside the orkut page for searching through scrapbooks,communities. The box added to the orkut page is context sensitive and automatically changes between searching scrapbook,community threads and community thread messages.
You can easily search for simple strings, user names and also specify date range to search for.This extension is pretty good for searching a particular user on orkut about which you may not not know the full details required for normally searching that user through conventional method.
Help box below the search tool gives details of all the options.
The greasemonkey script for the same is available at http://userscripts.org/scripts/show/6143