The Guide DB is basically a huge collection of PDF guides that you will find very useful. Whenever you search for any guide on this website, you will get many results. You can even preview a PDF before downloading it, if you’re in doubt whether the PDF is the one you are looking for.
Guide DB Search Engine, powered by Google
The Guide DB is in short a Search Engine, powered by Google and searches only for guides.
Here’s a screenshot of what results I got after I searched for “Microsoft Windows 7”.
For checking out some PDF guides, head over to The Guide DB.