I spent a great 4 days at the Isle of Man TT as a guest of Honda Racing. Here is a link to the photos. It was surprisingly difficult to achieve sharp images as the bikes are travelling very fast and close to you, within a few meters. Fast shutter speeds are required with small apertures, as so little of the bike would be in focus otherwise. This lead inevitably to high ISO’s (up to 3200) in the sections under the trees, such as at Ramsey.
http://www.waynegrundy.com/tt14
Wayne John Grundy's PhotoTech Blog 