The Google search engine is an amazing thing.

Using search-bots that scour the web, Google is able to provide web surfers instant access to billions and billions of documents - many of which are meant to be hidden away.

Some of these hidden documents include the full text of expensive ebooks, reports, contracts, and marketing materials - all of which you can find within seconds - if you use this little trick.

Next time you use Google to find information, add the following to your search parameters: filetype:pdf

For example, if you want to learn how to generate revenue with Google AdSense, search Google for 'adsense profits filetype:pdf' (no quotes).

You'll be amazed at the results.

Google will return the full text of .pdf documents, including a number of expensive reports you can freely download and read.

If you add the 'filetype:pdf' to any search for how-to information, legal contracts, or ebook titles, you are likely to be stunned with what you can find. And it will all be free (and legal), thanks to Google.

One other thing - if you are selling a .pdf document, search google for the title of that document along with the filetype:pdf parameter to make sure the report is not available free in places you don't want it to be.