Before this query gets burried deep let me link to live examples:
click on the following two links see the results:
http://www.ultranerds.com/...=25&query=custom
http://www.ultranerds.com/...=25&query=custom
If the searched word custom gives identically similar results, then what's the great purpose of havin this radio button of exact and similar words....
A search for custom on Alta Vista doesn't yield highlighted results like customer. Here no matter what a user selects as option, he would always get customer in search.
HyTC