Google Docs and Evernote's Skitch provide a great platform for creating great documentation that can be shared with anyone and on any device (remember, a person doesn't need a Google account to view or even edit a Google Document shared with them if you select the 'Anyone with the Link' sharing option).
A Google Document has much more in common with a web site than it does Microsoft Word. A Google Document's location is based on a uniform resource location - a URL. The URL was created by Tim Berners-Lee, the inventor of the World Wide Web, in 1994; URLs form the foundation of the Web. Tim invented URLs because he thought it was too hard to share content. URLs and the Web have obviously led to an explosion of creating, sharing, and collaborating.
The URL was invented to make sharing easy - regardless of location, operating system or device. The URL is the Web's special sauce. While the URL has delivered tremendous value to consumers, it is still heavily underutilized in the Enterprise. So rather than sharing a URL, you see dozens of copies of a .docx or .xlsx file. A .docx file is a thing, a Google Document is a place. A Google Document is a URL.
Google Documents provides a great way to create a website that can be shared with anyone, anywhere and on any device.
Evernote's Skitch provides a great way to quickly grab screen shots, mark them up and the ability to quickly drag the screen shot right into your Google Document.
As an example, let's say we wanted to quickly show a few dozen people in our organization how to create a drop-down menu in Google Sheets. We can grab our screen shots with Skitch and simply drag and drop them into a Google Document. We can then share this Google Document URL with anyone interested. You can even use Skitch on your mobile device to grab screen shots and mark them up on your phone or they'll sync to your PC and you can mark them up there.
When people talk about apps built for the Web, they're talking about apps based on URLs. With Google Apps, anyone can create and share content with anyone else with a few clicks. You can thank Tim Berners-Lee and his URL!