Lets see:
What bike?
What tires?
What fenders?
Racks or backpacks?
Platform or clipless?
Lycra or pants?
Jersey or shirts?
Helmet or no helmet?
Gloves?
Cotton or Polypro or Wool?
First time commuter
First\second\third\etc week\month\year of commute
Flats: prevention, how long/often
Frame pumps, mini pumps, floor pumps
Sun block
Mountain or Road shoes?

And thats just what I remembered in the past 2 minutes. But I'm not complaining. If these threads never gets repeated this will be a pretty dead forum.

Long live the repetitiveness.