Here's my commuter / main bike:

It's a 2008 Specialized TriCross Comp. I turn it into my commuter by putting the Topeak MTX beam rack on it; I've got the DX bag that slides into the beam rack.

Lights are Niterider Minewt X2 Duals in front and a Mars 3.0 in back clipped to the bag.

Tires are Specialized Borough CX Armadillo Elites.