Use multiple accounts with Heroku
https://github.com/ddollar/heroku-accounts is a plugin for Heroku to allow you to use multiple accounts, e.g. work and personal.
To install: heroku plugins:install git://github.com/ddollar/heroku-accounts.git
Then set up each account:
heroku accounts:add personal --auto
heroku accounts:add work --auto
Set your default: heroku accounts:default personal
Then to switch account for an app: heroku accounts:set work