I finally threw the towel in with Blogger after years of faithfully hosting my blog there. I just can't cope with the fact that, in the 2nd decade of the 21st Century, I was using a service which couldn't automatically handle paragraphs and things; the code zealot in me couldn't handle bad code.
I looked at Posterous but I don't like the idea of putting my posts on a service which could, potentially, disappear from the face of the Web overnight. I'm sure it isn't the case, but it's just that niggling doubt that makes me uncomfortable. Octopress, on the other hand, gives me the power to self host and distribute copies of my source in a flexible manner. I've been recently teaching myself Ruby so Octopress had a certain appeal; I also love Markdown and the combination of the two made it a win win for me. I've tweaked it a little (I’m not a fan of how rubypants encodes characters instead of just using UTF-8) and it now obeys my commands.
I think the most appealing feature is that I keep my posts in Markdown and I am able to publish to a variety of platforms (not just Github) with ease. Meaning that I can progress from Github at any time but still keep absolute control of the content that I produce.