It wasn’t easy installing Typo on my ISP because RoR is quirky.
These helped:
* [Typosphere Wiki](http://www.typosphere.org/trac/wiki/DreamHost)
* [DreamHost Wiki](http://wiki.dreamhost.com/index.php/Typo)
* [Alex Young's Advice](http://work.alexyoung.org/archives/102/dreamhost-and-rails-500-errors)
Ultimately, I needed to flush caches and kill ruby processes