I just replaced the WordPress plugin I use for enabling Markdown on this site. I've already forgotten the name of the plugin I got rid of. All I know is that it was giving me headaches when I went to clean up code snippets in people's comments. The right Markdown plugin to use is either PHP Markdown or PHP Markdown Extra (I use the latter) by Michael Fortin.

Here are all the WordPress plugins I use on this site:

• Akismet. Spam blocker.
• Markdown Extra. This is how PHP Markdown Extra is listed (without the "PHP") on the WordPress admin page for plugins.
• MediaElement.js. For embedding video and audio. I used this to embed mp3 files in my two posts about Cantonese text-to-speech.
• Unfancy Quote. Replaces the curly quotes that WordPress generates with straight quotes. I installed this so that code snippets don't get messed up.
• WP-Syntax. Applies syntax highlighting to code snippets.
• WP Super Cache. Page caching, aka protection from being Fireballed or Slashdotted. Hey, you never know.

By the way, both Markdown and syntax highlighting work in comments as well as posts. If you want to include Objective-C code in a comment, you can wrap it with <pre lang="objc"> and </pre> and it'll be syntax highlighted. One of these days I'll get around to making that clear in the comments UI itself. I should really look for a plugin that will allow you to preview comments, but that'll have to wait until the next iteration of my procrastination runloop.