Blogger to WordPress migration helper

A while ago I moved my blog from Blogger (socialscienceplusplus.blogspot.com) to a custom WordPress installation here (anyall.org/blog).  Wordpress has a nice Blogger import feature, but I also wanted all the old URL’s to redirect to their new equivalents.  This is tricky because Blogger doesn’t give you much control over their system.  I only found pretty hacky solutions online, so I wrote a new one that’s slightly better, and posted it here if anyone’s interested: gist.github.com/15594