Enhance Usability by Highlighting Search Terms

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.

Suda, Brian and Matt Riggott. List Apart, A (2004). Design>Web Design>Usability>Search