Enhance Usability by Highlighting Search Terms
http://www.alistapart.com/articles/searchhighlight/

Suda, Brian and Matt Riggott
List Apart, A
2004

Abstract:

Google's cache offers users a copy of your website with their search terms highlighted. You can do the same thing and make it easier for users to find what they’re looking for — whether they're coming from an external search engine or your own site search — by making their search terms easy to spot.