Hey Matt, save yourself a lot of time and take a look at Google's gData API for Blogger.
http://code.google.com/apis/blogger/
If you're programming in PHP like me, you'll notice that Zend offers a PHP library to access all the gData API's really easily. Unfortunately, this requires you have the ability to edit php.ini to use. I don't have that option (for my youtube app), so I actually just used Magpie RSS to parse the ATOM feed (returns all $items). Fortunately for you... the Blogger feed looks like is structured infinately better than the youtube one...
If you have any questions keep posting...