abbieD,
The best one I have seen that works locally is
HotDog's 'Multi File Find & Replace.. but it comes with a big price tag...
I now use and reccomend -
Abacre - Advanced Find and Replace -
http://www.abacre.com/afr/index.htm - Spend the 30$ it will pay for itself 10x over..
Pick what you want to replace, point it at a Dir and press go... DONE
DD