Lately, I’ve been playing around with Google Custom Search Engines. All you have to do to build a search engine is sign in to their site with your Google login and press the “Create a Custom Search Engine” button and fill out the simple form. There are a lot nice features such as being able to create search engines with other people, being able to add your search engines to iGoogle or webpages as gadgets, and being able to link your search engine to an adsense account.
You can check out all the search engines I’ve created so far at my search engine page.