Quick aside... Speed wobble caused the scariest moment of my cycling life about 2 weeks ago during a descent I've done a thousand times before. It's about 1/2 mile long, and I don't know the grade but I hit speeds in the upper 40's every time.

As I'm approaching top speed, I start getting front end wobble at about 45 mph. I look down to see traffic approaching, and I'm drifting into the other lane as I can't control my direction. I had to consciously relax, slow things down mentally and make clear decisions, release the death grip from my bars, and gently apply the brakes... none of which are easy when you think your about to hit the deck and slide under a minivan.

I didn't know at the time to put my knees into the top tube. I'm glad it was mentioned above should this bib-dirtying experience happen again.