I've just created a new search engine using Google Coop. You can start using it on by entering search terms on the search box on the right.
You may also add it to your browser's (Firefox 2.0 or IE 7) search engines.
This search engine is customized to search Java, Ruby, Rails, Hibernate and Spring Framework API and reference documentation. More API and reference documentation for things that are in my area of interest will be added in the future.