This is really nice and simple, and might be nicer if you supported selecting the applications from the terminal like..

curl -s http://getmacapps.com/raw/chrome:firefox:sublime | sh

Additionally, if you're interested in supporting it, I think this process would work with my "Install all firefoxes" shell script, that works in a similar manner (it curls dmgs, installs, etc.) You can see more about it here - https://github.com/omgmog/install-all-firefox

Might be worth adding descriptions, and links to the original sites for applications, so that people can discern if they want to install them or not.