Now that I have your attention...
I have a rhythmic vibration that appears to be every rotation of a wheel. It can be felt through the steering wheel and the seat and the floor... woo. At first I thought it was due to the fact that one of my tyres had a huge chunk missing from the sidewall, but apparently not as I got that replaced.
What could this be? It's obviously more noticeable at higher speeds. Is my wheel buckled, or is it something more sinister?