Tried / liked:
Soma Rush - consignment, low gear ratio, fixed, great for spinning and adopted as my commuter bike
Velo Orange stem - looks great, very modest
Nitto bars
Shellaced Tressostar cotton grips - 6 months and they look like new, except where I missed a spot
Old Gitane from Craigslist - first French bike, Vitus steel, feels great, I have some ideas for this...
Gore gloves
Showers Pass Storm Pants - fit in saddlebag or backpack, easy on, poor breathability but that's not a problem when it's really cold here!
Klean Canteen stainless bottle
MKS tall toeclips - allow for commuting in boots during the rainy season
Bikeforums.net - really specific questions answered by Sheldon Brown's ghost

Tried / meh:
Fizik Alliante (carbon rails!) – came on my consignment Soma, poor feel after riding for a couple of hours, replaced it with my B17
SKS Race Blade – serves its purpose, but requires frequent adjustment