Why Another?
Tom Preston-Werner, the cofounder of GitHub, wrote Jekyll, a blog-aware static site generator, for the whole GitHub community to use.
Octopress is another static blog generator based on Jekyll by Brandon Mathis.
Brent Simmons, the author of inessential.com, uses his own static blog generator.
Movable Type's default mode is static.
Yesterday, Marco Arment released his static blog generator Second Crack.
I bet there are bunch of other static blog generators out there. Hell, that's a lot of static generator for blogs. Why bother making another?
Because none above fit my exact needs. And well, some programmers like yak shaving.