Search utility that searches pretty much any file format using standard text or regular expression. Extremely efficient also searches within files.
NOTE: The search indexing feature in Windows 7 is pretty dam good.
Features from AgentRansack Website.
Easy to use web style Boolean searches
Search popular Office formats including Office 2007 and OpenOffice
Super fast multi-threaded searching with highly efficient search algorithms
Quickly browse file search contents without having to open up each file
Automate searches using command line options
Share results with others through printing and exporting