Specialized

Creative Commons Search
Powered by Nutch, it searches for content which can be re-used (for some uses) without having to pay or ask permission.
http://search.creativecommons.org/

Green Maven
Green Search Engine which provides environmentally aware results, includes news and products.
http://www.greenmaven.com

IFAC net
Global accountancy search engine, provides industry articles, guidelines and management tools.
http://www.ifacnet.com

Jamespot
RSS feeds search engine indexing blogs posts, news sites stories, audio and video podcast in 33 languages.
http://www.jamespot.com

SearchIRC
Search Internet Relay Chat rooms and networks.
http://searchirc.com/

Simply Hired
Provides a sizeable database of jobs, collates material from several businesses.
http://simplyhired.com

360view4u
Searches RSS feeds: news articles, press releases, news archives, and blogs, using the Google XML service.
http://www.360view4u.co.uk

ZoomInfo
A business information search engine, providing company search, people search and job search. It constructs profiles on people and companies, drawn from the Web, or created by individuals and companies for themselves.
http://www.zoominfo.com/