Denver's pretty good for me. I live 2 residential blocks away from the main bike path that goes into downtown (8.5 miles each way) along a creek. This same path has at least 3 other "spokes" from different parts of the city. Other roads have signs that say share the road and there are some designated bike lanes.

Today, the bike path was flooded due to it raining all day(very rare) and the brilliant Corps of Engineers letting enough water out of the dam upstream to almost flood the creek without the rain. Now Denver will have to pay to clean up the path over the weekend. But it's kind of nice that it will be swept and nice again by tomorrow.

I'd have to say though that after reading some of the stories on this site that if I had to commute along streets, I would probably take the bus again. Not worth it.