BoardReader
Searches a variety of message boards and forums in 14 different categories.

BoardTracker
Searches a wide variety of forums organized by category, includes email or IM alert capability. Basic functions are free, advanced ones require paid plan.

FindArticles.com
A searchable online archive of magazine and journal content.

FindSounds
Search for sample sounds and sound effects at this file search engine. Offers directory, keyword and sonic similarity search functions.

Netcraft Web Site Finder
Searches domain registrations that contain certain words, strings, or characters. Reports a site's operating system, web server, and netblock owner.

Phaster: Search Discussion Boards
Search a selection of discussion groups including All Experts, Blog Hop and Google Groups.

SearchIRC
Search Internet Relay Chat rooms and networks like you would search the Web.

Who Built It
Reverse search - enter a URL to find out what designer, developer or interactive agency created a website.