[ask] have you used Heroku?

I have limited experience with Heroku, tested the beta for a bit. For small/development apps I say you can't go wrong. I don't know anybody running production apps on Heroku yet, but it wouldn't surprise me if they are.

The Heroku guys are friendly and competent. If you don't have a dev environment, they provide one for you. If you have your own, their gem makes it cake to sync your changes to their servers.

My only beef would be that they have a custom Rails install that you're forced to use, so you lose a little flexibility, but all in all that's not a major hold-up.