I’ve just setup HTTPS and HTTP/2 for zerosleeps.com, thanks to Let’s Encrypt. Apart from the familiar padlock somewhere in your browser’s interface, nobody should notice any difference - any requests for http://zerosleeps.com/ and http://www.zerosleeps.com/ should be redirected to https://zerosleeps.com/.
I’ve been using Let’s Encrypt on some of my less-public servers pretty much since day 1 of their beta program, and it’s a game-changing service. Their toolchain is top-notch as well, and strikes a great balance between preserving existing configuration, and making it easy to see what is modified.
They’ve got some good stuff in the pipeline as well - wildcard certificates will be an awesome addition.