I have a programming blog that was implemented using the default theme of Movable Type. To that, I have added myself a syntax highlighting plugin for adding code snippets. It's not the best thing in the world, but it served its purpose for a long time.
Problem is my administrative interface's editor is no longer working so I think it's a good time to migrate.
What is your experience with blogging frameworks, specially blogs related to programming, that involves a lot of coding snippets?
Is there something out there as simple as what we use here in Stackoverflow (I think it's Markdown, right?)? Is this code formatting engine used here a customized version or is it available for reuse?
I know that the most used engine is WordPress. But for a programming-related blog, is there anything else you would recommend? I am looking for solutions that are easy to maintain (and to add new postings) and extensible.
More than that, where would be a good place to look for templates, since I am not a very gifted designer, I might benefit from freely available or even paid templates.
Additional information
I have one constraint I forgot to mention: it must run on Linux-friendly software, because that's all my hosting supports. Thanks for the one suggestion so far, but unfortunately, I'm stuck with Linux.
Edited to add more information about my constraints