
There’s a lot you can do with Google if you can take advantage of it’s advanced search features. Expanding on this tip which shows you how to find music in open directories, here’s a step-by-step walkthrough on how to use Firefox Smart Keyword searches to speed up the process.
All you need to do is:

You can modify the code in the text file to change file extensions, which opens a whole window for you. For example, you can even change it to PDF and DOC to look to e-books, or AVI and MPG to look for movies.
By the way, I’m assuming you already own the media you will be downloading :)