I came across a very informative article about retrofitting old houses that have rubble foundation walls. It's very interesting to me, since these are the kind of walls that my basement has and I've been racking my brain for ways to bring it up to par with the newer homes. It's basically a chronicle of one person's experience in retrofitting one of these basements.
Here's the article:
Building Science Insights
BSI-041: Rubble Foundations
By the way, this site has some VERY detailed information about energy retrofits and insulating, definitely worth some reading around.