I'm a teacher and Chromebooks are the "hot thing" right now in schools, mostly because they are cheap, light, and very mobile. Just like Google has Google Apps for Business, they also have Google Apps for Education and tons of schools are switching to that to give kids their own email address and access to Google Docs, along with the teachers. Google Apps are certainly neat for collaborating.
A Chromebook is typical smaller and lighter than a laptop. I think a perfect use of it is light email and web browsing. They have a really long battery life. Every program (or app) that is on it comes from the Chrome Store, basically the same as the Google Play Store. For word processing you'd rely on Google Docs.
Would be a nice use for your dad in his semi, as long as he has an internet connection. Otherwise it's pretty useless, as mostly everything is done online or saved to the cloud.