Well, I will often start work on a new (to me) project. Since I have a lot of projects on my drive, I use rvm to manage them. I add an .rvmrc to the project root, which creates a gemset for use in that project. Since too many projects seem to be using Bundler, I also then need to say:
% gem install bundler
% bungle install
"bungle" being my semantically appropriate alias for 'bundle' on the command-line.
It's a bit jarring, however, to install a gem of one name, and use it from the command-line under another name.
So, now I can:
% gem install bungler
% bungle install