I just switched from using Passenger to using POW because I didn\'t have to run the Apache server to run rails apps on POW. But I\'m not having luck running MAMP Pro and POW sim
There is a shell script if you need to switch between running Pow and Apache: https://gist.github.com/919084
And another script in ruby that changes Pow's listening port, so you can still run Apache on port 80: https://gist.github.com/911687
Also, I would suggest you to install powder gem