MS Index Server, if you're on IIS will do this, free. Verity (is it still around? or part of Cold Fusion?). Not sure of price. Not sure if this one does PDFs, assume it does: http://www.picosearch.com/ Lots and lots of options out there, and most search PDFs and other binaries as well. What platform are you on, and what's your budget (less than $599/mo, I take it).