SHORTBLOG ALERT I'm putting this here for posterity as it seems this information is not easily accessible and quite a few people ask about it in comments. The current (Season 4, 2012) opening theme of Podtoid is the theme to Metal Arms.
Yeah, i know forums are that-a-way. http://www.youtube.com/watch?v=H_Bc0cItv10
LOOK WHO CAME: