Lately, I've been testing out different static site generators but it's a sea of alternatives. My favorite so far is Punch but the non-existing support for articles/blog-posts and subfolders makes it not so good...
So, what's your favorite?
(Let me know if I missed someone, poll options are taking from here: https://gist.github.com/4181764)
The other nice thing about Hakyll is that it uses Pandoc, so it supports different input and output formats (such as HTML slide generation from Markdown).