I picked up an early 90's steel cyclocross bike for commuting and retired my comfort bike to the paths with the kids. For the heck of it, I weighed the bike before I commuterized it...26 lbs. Then I added my gear:
Rack
Fenders
Blinkies
Headlight and battery
Full water bottle
Panniers
1 set work clothes
Multitool
Spare tube
Frame pump
Lunch and snack
Spare gloves and headgear for changing weather.

All in - 42 lbs. I guess I won't be making that next saddle choice based on one being 30 grams less. Has anybody else weighed their rig in ready to go to work condition? How much junk are you carrying?