Here's my main commuter:

Mid 1980s Schwinn Mesa Runner MTB. Crankset is Suntour Blaze from a yard sale Specialized road bike. Nitto Northroad bars and Delta AirZound Horn from Harris Cyclery. Brooks B.17 and cork grips from Hiawatha Cyclery. Nashbar rear rack and "Townie" grocery bag panniers. Two Cateye EL200 lights up front, Planet Bike Superflash on seatpost. SKS/ESGE fenders from the half price table at LBS. Michelin Transworld City tires. NOS Suntour pedals from a thrift store.