I don't get what the Raspberry Pi is for. The Transformer is a lot faster and already runs Linux, you could just install Ubuntu/Debian in a chroot and use that instead of sshing to the Raspberry Pi.
I have not found it easy to install Ubuntu or Debian on the JellyBean Transformer. Since I had already ordered an RPi, this seemed altogether easier. The RPi also has the advantage of being able to serve as a single-user server when I want to quickly test a rails project or a backend for one of my apps.
This exactly. He has a very good Transformer setup that I'm going to duplicate. The only reason I could see for the PI is if he used it to provide USB Host mode or something similar - connecting the two long-term to extend their features.
OR if he were programming the PI from the Transformer...