tsl is right, drivers are ONLY looking for cars. The brain that has been habituated to a norm for decades tends to just not see things that it's not used to seeing. I suspect that for this reason, on a per-thousand-rider basis, people in areas where there is less cycling probably get hit a lot more; the drivers are simply not looking for cyclists, so they really do not see them even though they're right there. Also they don't know what to expect - if they do see a bicycle, their only experience may be with some old man or child wobbling along at 5 MPH, they're not expecting a cyclist to go 25 MPH and that leads to trouble like right hooks and left crosses when they vastly underestimate the cyclist's speed.

Glad you weren't hurt anyway. Hope you're made whole again with respect to brusing and equipment. Be sure to get your clothing replaced as well.