Awhile back, I wrote an entry in my other blog (http://www.marcmercuri.com) that talked about how easy it was to build a custom search engine using Live Search Macros. I've gone ahead and written this up as a proper step-by-step lab.
Search macros are cool and very easy to create (no coding required).
You can find these in the resources section on the http://www.mashupguy.com site.
Cheers,
Marc