So, who am I, anyway? I suppose a perusal of the links below will have to do for now. I'm an autodidact for the most part; so take everything I say with a grain of salt ;).
I like seeing diagrams for both physics and mathematical topics; it often helps clarify text that otherwise would have to resort to tortuous verbiage along the lines of "now, imagine that there's a rod connecting A and B, rotate it through the 4th dimension...". If you have an article that you think could use a diagram, let me know on my talk page.