Here are the slides from my presentation "Vadå Lean Software Development" (Introduction to Lean Software Development) at HiQ on Oct 13.
Note – the picture above (the last slide in my deck) can easily be misinterpreted when used out of context. It is not meant to imply that XP is a subset of Scrum, or that Agile is a subset of Lean. It just means that Lean addresses a very wide scope – principals like "limit work to capacity" and "continuous process improvement" are applicable in just about any context. While XP is more concrete and limited to the domain of software development. Scrum is somewhere in between – it is not limited to software development, but still mandates the use of timeboxed deliveries (sprints) and a product backlog. Agile is higher level – just a bunch of values and principles and no practices at all. Etc.
There are lots of ways of visualizing this. My picture is simplistic, if anyone can come up with a better one let me know.