Project Management Qualifications

I was delighted yesterday to discover that I passed my PRINCE2 practitioner exam, and can now call myself a qualified PRINCE2 practitioner. At the moment, I am working on a project that uses a related (very very close cousin, I would say) simplification of PRINCE2 called PRIDE/PRIDElite, and am just trying to get to grips with the differences (mostly these are terminology and/or quantities of specific project documentation) between it and PRINCE2. This got me thinking about relationships between project management methodologies - there is an underlying philosophy or approach to each method, and - having come across a relatively close overlap relationship between two methodologies - I was wondering whether anyone has come up with a visual/written map/taxonomy of how the different methodologies relate to one another? I haven't come across anything yet, but I am sure that such a map might be useful to work out which methods are most appropriate for which type of project (based on duration; discipline; cost; organisation differences etc.). Just a thought...