Quick technology stack for new sites

This is the technology stack I use to quickly make and host a small web app cheaply.

Python + Django 1.4 (https://www.djangoproject.com/)
Hosted on Heroku (http://www.heroku.com/)
A MySql database hosted on Amazon RDS (This is only cost-effective if you have more than 2 sites using the same DB, otherwise, use Heroku's DB)
Amazon S3 for static file serving
Twitter Bootstrap for a base CSS/JS stack
Stripe.com for payments
Desk.com for help desk
BitBucket.org for source control (GitHub for open source stuff)
Pusher.com if I need real-time / push capabilities