What hardware do you use?
I am using a Lemote Yeelong, a netbook with a Loongson chip and a 9-inch display. This is my only computer, and I use it all the time. I chose it because I can run it with 100% free software even at the BIOS level.
And what software?
To initialize the machine and boot, it uses PMON. Above that, it uses gNewSense, one of the totally free GNU/Linux distros.
I spend most of my time using Emacs. I run it on a text console, so that I don't have to worry about accidentally touching the mouse-pad and moving the pointer, which would be a nuisance. I read and send mail with Emacs (mail is what I do most of the time).
I switch to the X console when I need to do something graphical, such as look at an image or a PDF file.
Most of the time I do not have an Internet connection. Once or twice or maybe three times a day I connect and transfer mail in and out. Before sending mail, I always review and revise the outgoing messages. That gives me a chance to catch mistakes and faux pas.