Admittedly not the greatest photo I've ever taken (or maybe it is and I don't know any better), but I managed to snag a shot or two of the Space Station this evening as it passed overhead...
It's a little small, but this is a 100% crop. Just glad that I could make out the shape.
Shot with a 7D at ISO 3200
400/2.8 lens and 2X teneconverter for a total of 800 mm
NR in DPP, sharpened a bit, cropped extensively, and pulled exposure down a bit.
Tomorrow, if it's clear, I'll try with stacked converters.
I need more lens!