Just a note, for those who are interested in deploying on Heroku, that
Uncooped.com and
WeeBabyStuff.com are now running on Heroku. I didn't want to use Heroku's standard postgresql db, so I'm using AWS RDS as the database backend (mysql), and so far everything seems to be running fine.
I plan on writing up something for the wiki on my experience deploying CE to Heroku; I think it's a really great deployment option for CE sites.
Bruno