Ehh, I'll post my modest bag, I've got too many hobbies to be any good at any of them:
Nikon D5000 with a 2-cell battery grip, second shutter release comes in handy
18-55mm kit lens
Nikkor ED 70-300mm
52mm and 67mm polarizers and UV filters
Vivitar shutter remote with bulb lock, handy for long star trail shots
Nikon SB-700 Speedlight, easily my most value-added purchase
T-Ring and T-Mount adaptor for prime focus telescope shots
Ultrapod 2 mini tripod
Quantaray monopod
Miscellaneous memory chips
Here's a quick shot mounted on my GF's 127mm Celestron, which does not fit in my bag