So you have an Octopress blog. And you host it on Heroku. And you use Github for your version control. Isn't it a pain to push to both Github and Heroku every time you make a change? (ok maybe not a big pain, but a small pain?)
After a quick setup via a few command line prompts, Mr. Hyde allows you to push to Github, and the code will automatically deploy to Heroku.
How it works
Mr. Hyde overwrites your code on Heroku with a Sinatra app that responds to a post-receive hook setup in Github by cloning the code and using a custom buildpack to setup all of your Octopress goodness.