especially near the top of steep climbs with "King of the Mountain" points.
I only had the time to catch two stages of the US Pro Challenge this year in Colorado, but they were both a blast. I saw some great racing, met a few of the pros, talked to people from all over the US and Europe, and met Bill Walton briefly (that dude rides a huge bike).
Here's a shot from Stage 6 on the climb out of Devil's Gulch on the way to Estes Park. ~12% grade but the break away group was still cranking at ~15 mph.