I actually commute on a variety of bikes, dependent upon the weather, my mood and the distance I intend to travel.
But this is my first purpose built long haul commuter, which I have named
Fat Tired Rider
Its a SR Litage bonded aluminum frame, circa 1990. Running with a Suntour XC Pro rear and Deore XT front derailleurs. The Suntour Barcon shifters are in friction mode to work with the Shimano 12-21 cassette. Mavic cranks mounted on a Phil Wood bracket sport 46-36-24 chain rings. Salsa stem with Dia-Compe levers. Old-school Mafac canti brakes.
http://home.twcny.rr.com/dobber/ftr_bar.jpg
The Deore LX hubs are laced onto Rhyno-Lite rims with IRC Metro 1.5" tires. The seat is a 14 yr old leather San Marco Turbo, Bernard Hinault signature series. Seat post is some massive billy club made by Sakre.
Haven't decided on pedals yet, right now I'm using a set off my Peugeot SingleSpeeder.