Search for text within files on Windows

Windows Grep - Advanced searching for Windows
WinGrep is a small utility program that lets you look for a string inside a bunch of files. It functions similar to a grep command run on a *nix terminal. It is very powerful, very versatile and very quick too.

Besides searching for string withintext,html,ASCII and binary files, itcan also globally replace strings.
The program is compartible with Windows 98, 2000, XP, Vista and Windows 7. You must try this program if your have used Window's default search but aren't satisfied enough.
Link: http://www.wingrep.com/