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Sheet Music Viewer shows a series of pictures related by name and number. Numbering is from 1 to 9. I developed it for using with my band and have found it an excellent tool. See it at martintw.com
I am no longer working on PhotoDirectory; I have changed my digital photo workflow, and am now relying on embedded metadata as the primary classification method, with directory structure for easier browsing. See http://image-tagger.sourceforge.net
Venn diagrams are an interesting method for rendering triadic relations on a two dimensional drawing surface. Certain marks (or annotations) indicate the existence of variables or constants in the distinguishable regions.