I posted a screencast on Heroku a few months ago. Since then, my company has moved all of their stuff to Heroku. It has been working really great for us.
I've had my blog on GitHub pages for awhile. I recently came across a good article on running Jekyll from the Ruby5 podcast. It was really easy to get setup. So far, I'm a fan of my new setup.
I'm still working on my Rails 3 version of my blog when I have time. Lately, I've been playing a lot of music and occasionally dabbling with Markdownr.com due to a recent spike in traffic (thanks to @defunkt).
So today I moved my blog from Ruby on Rails on SliceHost to Jekyll on GitHub. It only took a two hours to figure it out and move everything over.
The main reason for moving to the new setup (besides the fact that I love redoing my blog for some reason) was being able to manage all of my posts via Markdown files locally, then pushing then up with Git when I had a good version.Jekyll lets me do this easily and quickly.
I'm going to give this a shot for now. I don't really want to write a blogging platform, even thought I've written a ton. I just like programming. Now that I have more projects than I have time for, I'm looking for something simple that I can simply post with. When I roll my own solution, I end up working on it for a few hours each time instead of just writing my post.
Anyway, enjoy the new blog and feel free to checkout the source code on GitHub.