Spatial References In Your Format Of Choice-O-Rama

I was grovelling around for a full-blown GML representation of a spatial reference to stare at in, er, wonder, when what to my great delight did I discover? Spatial Reference-O-Rama! The site slings spatial reference definitions in the format of your choice. It's driven by user submissions, supports commenting, etc. The claim is "Put together in a day or two by Howard Butler and Christopher Schmidt." Very cool!

But wait, there's more!

Slippy map with *coordinates* in the SRS of your choice! Ausgezeichnet!