No this isn't some new superhero. It is the sound that my front wheel is making.
It is a once per rotation sound that is fairly quiet and only happens when the wheel is loaded. Initially I had thought maybe a bearing and asked my LBS to look at it. Initially they were unable to find it, but when we tried again in a quieter area with the wheel under load they heard it.
My LBS is great! They tried a number of things but were unable to correct the issue. My biggest concern was that it was a bearing that would suddenly seize, probably when I was doing 50 mph down a hill in traffic. I have been assured that this won't happen...probably. Without any charge for an hour of tinkering (or solution) I was assured that it would be fine unless it got worse.
I posted the question to the couple of boards that I keep up with and had a whole range of possibilities that were suggested, many that I was able to quickly discard or didn't apply because of the type of spokes and nipples that I have. There were four that I found possible: an un-round bearing about to seize, a crack in the rim weld, a loose skewer or a spoke nipple slipping. I added a fifth myself after some extensive research which could be a crack in the plastic bearing shield.
I hope its the simple skewer. If it's the bearing or rim; ACK!! That would be bad on the downhill-fast scenario. If I can't correct this with the skewer then I will have to get the wheel in to be rebuilt. FUN! The worst part is we are back to the Seattle drip, so I won't be able to test it anytime soon, and I fear that once it clears up I will be without my bike while I'm getting this dealt with.
The up-side is, once corrected I should be good to roll another 15,000 miles on these wheels.
Oh and the other up-side is, I got a chance to ride it (thus discovering the click). It was very, very nice to be back on my race bike!