I've always thought weight doesn't matter much for a commuting bike. It should be strong, comfortable, and not scream out to be stolen, but that's where it seemed to end. Most bike commuters seem to feel this way.
Mine is 29 lbs with lights and pedals. I went and added a rack, fenders, and panniers; the bags are useless when they're empty, so I keep a scarf, an extra pair of gloves, and a wool sweater in them, plus random other stuff, a pair of tubes, and bike tools. It's got to be about 50 pounds now. I feel like Yehuda Moon. Sometimes I stand over the pedals just to accelerate on flat ground.

But I think of it as weight training for the legs.
So what's the heaviest you think is reasonable, for a bike plus all your gear, for commuting?