One of my friends commutes * on a Trek 520, didn't really change much from stock, other than add top mount levers and Mudguards

Its pretty much like the current edition.. Mudguards : Planet Bike Grasshopper . its a Bamboo Laminate , super rugged..

* He comes in from where ever the space for his motor home parks, he goes south for the winter, comes back in summer to help out @ LBS.