This is only my 2nd week of commuting, today I left earlier so the first part of the commute was in the dark. Headlight did a decent job, no problem riding in the dark. All was going well, I felt good, making good time, shaving a few minutes off last weeks times, then I got a flat. Luckily I had a spare tube, CO2 pump and tools so I was right back on the road.
All in all a great commute with a couple new variables thrown in for kicks.