One interesting way to build a customized search experience is by using linked Custom Search Engines (CSEs). With linked CSEs, you can create a dynamically defined search engine that can be updated automatically. As an example, you can check 2008 Summer Games site, Custom Search box in the upper right corner that will offer you results from a set of sites that cover the games. A cool application to create a personalized search over your del.icio.us bookmarks is described in the tutorial Build
http://chocoku.stan-eo.com/creative-uses-of-chocoku-busby-seo-challenge-custom-search-engines-cses/3079

