cheat sheets.

Heroku - heroku.com

Still in private beta.  Signup http://heroku.com/beta or get an invite from
someone.

Once you have an account, and assuming you have a working Git install and a
valid ssh keypair, you can do:

% sudo gem install heroku
% heroku list  # enter your heroku account's username and password
% heroku upload_authkey

Now, let's create a new app:
% heroku create testapp

Browse to: testapp.heroku.com and you should see the default start page
You can edit the code through the online editor if you wish.

If not, create a local working environment
% heroku clone testapp

Make your changes, commit them, then do:
% git push

The app will restart and automatically deploy your changes.

Pretty sweet, if you ask me.