F1 is my favourite but I tend to enjoy any kind of racing.
That includes NASCAR on the superspeedways and road courses, CART, IRL, WRC and even 12 year old kids racing go-karts in the rain in England, if the competion is close it's interesting.
You are right about motorcycle racing, poetry in motion and for the insane there's always the Isle of Man TT.
My only experience has been driving a 1969 Z28 Camaro years ago in NHRA Super Stock and a '66 Nova in stock. Still a lot of fun and much better than just watching from the sidelines.
