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Google is a search engine that indexes records based on their popularity; the degree to which other popular pages refer to a page. Google also allows you to go to the page as it is currently on the Web, or go to a cached copy Google stored when it retrieved the page (nice when the current page won't connect). In addition, Google allows you to find those Invisible Web documents: PDF files. You can also view them in ASCII-text (nice when you have a slow connection or the PDF is so large that you don't want to wait to display). From Google's Advanced Search, you will see that in addition to allowing you to limit your search to finding PDF files, you can now limit or exclude other file formats, such as Adobe Postscript; Microsoft Word, Excel, or PowerPoint; & Rich Text formats.