Laura Milligan from the College@Home blog posted about "100 Useful Niche Search Engines You’ve Never Heard Of".
The list is quite extensive and includes search engines for quick answers, travel, shopping medical, reference, business, law, jobs, photos and other interesting topics.
Most of the search engines on Laura's post are familiar to researchers and librarians. The only one that I didn’t see ( an it is one of my favorites) is the travel search engine SideStep.
A few days ago Laura Milligan posted another list with "100 Useful Web Tools for Writers",which I find interesting.