I'm a real estate agent, and I have to keep filing all the legal paperwork - and if I needed to scan it, I would have to haul those documents to a friend's office and use their rickety scanner.
Now - I just have to use my phone and pop - the scans are digitized! It also has a ton of nifty features to make the scans more readable and share with my customers.
I never understood why we need physical documents - but dealing with the government means that we have to keep using them anyways; and sending them across cities meant either couriering them, or scanning and faxing them. Now with pop scanner, I can just scan a copy and send it via an email to my business contacts really easily. Thank you, Pop Scanner!