A Cygwin free version of SED can be downloaded from here: http://gnuwin32.sourceforge.net/packages/sed.htm
Here is a nice Introduction to SED: http://www.grymoire.com/Unix/Sed.html
This link provides information on using SED: http://www.catonmat.net/blog/sed-stream ... eat-sheet/
The SED FAQ can be found here: http://www.grok2.com/sedfaq.html
For a list of other Cygwin free UNIX tools that run on Windows go here: http://gnuwin32.sourceforge.net/packages.html
Cheers Jussi