For some purpose maybe you want to search any PDF file that contains some information for free. I think best way to find it is through search engine. Google is the best one search engine with modification search, you can easily find some PDF file.
Are you using Office 2013? Office 2013 component such Word, Excel or Power Point have start screen as preview what you have done last time and show any template that you can use for your job. Every time you open application, it will open start screen by default.
Every time you login to your Facebook account, most of you might be check your Facebook notifications to check newest event to your account such if someone write something on your timeline or any Facebook games request from your buddy.