I typically have my phone with me and often times it's even charged. So if I see something I want to capture for posterity I use that.

There are some folks on this forum that are gifted at making cycling videos. I guess I have a question though. If some dude posted a video of his drive to work taken from a camera he stuck on his dash, would you want to watch it? Most cycle commute videos don't really look any different.

I suppose there'd be some value of having a camera if I were in accident and wanted evidence. However, I'd find myself wanting to get into an accident in order to justify the expense and hassle of mounting a camera to my bike in the first place. I don't want to put myself in that position.

Now, I do have my geeky side. Last year I taped a keychain camera to the side of a model rocket. That was cool.