despite owning an in-theory-perfect-for-winter commuter with IGH, drum brakes, and a belt drive, I decided to make my folder my everyday commuter (26 miles round trip in Boston). Two main reasons: if the weather really sucks I can take it on the train home, and it's much more fun to ride than the bulky bike. Here's the setup:
full profile. note the AirZound canister attached to the front of the riser (don't need to grab it ever) and water bottle on rear side of riser. crossrack and bag, with pump attached to seat post (also a handy reminder of how far to insert seat post)
Marathon Winters (200 studs, I think), front inflated to 55 and rear to max of 70 (i'm heavy). motion-activated value-cover lights, neon reflector, u-lock mounted to fork
"campus" pedals, flat on one side with SPD clips on the other. great for a quick start at an intersection, or just for riding w/o clips through traffic
kickstand, MagicShine battery resting above rear brake, motion-activated valve cover lights, and MagicShine taillight
(L to R) bar ends, bell, Magicshine headlight, GPS, slightly-hidden AirZound, water bottle
PlanetBike blinky and MagicShine taillight (mouted on rear fender - not my favorite spot, but it works and there's nowhere else to attach it easily...thinking of just getting a SuperFlash instead)
reflective goo on the Marathon Winters and the Xootr bag
Boston Cyclists Union sticker
fits nicely once you get to the office, no dripping on the carpet