Interesting article by Stephen Turbek on the oft-unused advanced search box. What really caught my eye was this quote:
Who does use advanced search?
Tim Bray wrote, “The people who do use Advanced Search are your most fanatical users, the professional librarians, spooks, and private investigators.”(2) As in many situations, segmenting a population makes it harder to see whether the needs of a subgroup are shared by the majority. Current design is based on the idea that there are two separate audiences with distinct needs. The reality is that there are overlapping needs that are limited by the search pattern.
As a fanatical Librarian, this spoke to me ;-). Get the whole article at http://www.boxesandarrows.com/view/advancing-advanced .