Question About Site Searches

I am starting to have trouble finding things on my site and am in need of a search engine for the contents. I was thinking of going with Googles site search because I might be able to get Advert Revenue, but I don't think that it is really an issue.

Does anyone know any good, free site searching software. If you do drop me an email: paul.kinlan@gmail.com or leave a comment.

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