Ok. Here are mine. I try and commute on them all. Not at the same time.

2009 Yeti Arc-X cyclocross. The newest arrow in my quiver. Sweet ride.
2008 Gary Fisher Presidio cyclocross converted with a flat bar. The switch to the flat bar set up made the whole bike 2lbs lighter. The front end is unreal light compared to all my other bikes.
2001 Rocky Mountain Team Only Vertex with BionX PL-350 Electric Conversion kit. So much fun. Don't knock them till you try them. It doesn't make you lazy. I pedal as hard as I normally do, you just end up going faster for the same effort. In fact it's awesome for your rest or easy days. You can soft pedal and still get to work in a decent time. Before I had my ebike, on a Monday after a weekend of long hard riding. Usually I was too tired to want to ride my bike and would drive. With the ebike I ride and get active recovery and still get to work quickly. I love it.
2006 Cannondale F4000sl. This bike is deceptively fast with slicks. I do some of my best commute times on it, even compared to my cross bikes. I'm just comfy and confident on it.
The disc brakes inspire so much confidence the riding position is perfect for an aggresive commute. The Fox Terra Logic Valve, Lefty Fork is perfection. It is fully rigid when you want it to be and absorbs when you want it to. No imput required from the rider, it just knows what you want. Plus the bike is just damn light. It should be great considering it had an MSRP in Canada of $5999.99 in 2006. No, I didn't pay that.
Last but not least.
1997 Rocky Mountain Cardiac. Fully rigid. Just a solid quality machine. The whole drivetrain has been replaced to around a Shimano Deore level. This is my winter beater commuter and early spring and late late fall training bike. Still going strong.
I hope you enjoyed viewing my collection,
LesMcLuffAlot