This blog post you are reading right now is a Ruby on Rails site, hosted on Heroku, that I have been working on as a learning experiment and to keep me involved in the Rails world. The posts are written in Markdown and comments are handled by Disqus.
However, I recently came across a post about installing WordPress on Heroku which then lead me to this project on github by Matt Hoofman. I decided to give it a shot and use two domain names I've had laying around for a while as my guinea pigs. Within an hour I had both sites ControllerFeed.com and NormalRunner.com up and working. I was extremely impressed with how easy it was to do on Heroku and think its a great way to try out an idea you might have for a blog without having to setup paid hosting to do so.
Let me know if you've tried this out yourself and what your thoughts are about using Heroku to host a WordPress site.