I put Miss Lightweight in the shop yesterday. I was hearing a loud crack in the front of the bike when I'd hit a bump with the front wheel pretty hard and going along at a pretty fast speed. I had inspected the frame and fork repeatedly but never saw anything suspicious. However, I had never removed the fork and inspected the steerer tube. I really trust these guys and wanted a second opinion.
They removed the fork and looked at everything and didn't find any issues. What I was hearing was probably the shifters opening and closing very quickly and making a loud cracking or whacking sound. My LBS guy said the Shimano shifters were known to do that. I'll certainly listen for that in mind in the future.
At least now I'll have a little more piece of mind when screaming down a hill at 40-50 mph not worrying about the front fork collapsing on me.........too many other things to worry about!!!!