PDF Genie is a new search service which is tailored towards PDF documents. It uses the Google engine and therefore is not hugely innovative, but what makes it more deserving of attention is the integration of the superb PDFMeNot tech, which means that you can view PDF stuff immediately without having to fire up the dreaded Adobe Reader. That leads to very fast browsing of search results (just click on the magnifying glass), which leads to more time for relaxation, laughter and fun with the family. Or something.
PDFGeni is a dedicated pdf search engine for PDF ebooks, sheets, forms and documents.