Create a Custom Search Engine on the fly

Setting up a  custom google search engine for selected sites by hand is tedious, but now you can make one in a instant based on all the links on a page. Enter the URL of a page with lots of related links you'd like to search (like google.com) and a search term into the Custom Search Engine On-the-fly page. You'll get results from both the linking page, and the pages it links.

Create a Custom Search Engine on the fly [Google Custom Search via Google Operating System]