I had an interesting article forwarded to me from a popular website (thanks Quail!)
http://teamsky.cyclingnews.com/tech-features/how-to-stop-cramp-team-sky%e2%80%99s-expert-guide/I thought it would be an interesting read.
Personally, cramping has been an issue for me. After the last two seasons, it appears I'm starting to figure out how to minimize it. I'm sure every athlete is different, but in my case I believe that I cramp because I can't relax my muscles. As a ride becomes more intense, tension in my muscles starts to increase. If I don't conciously take opportunities to relax them, I cramp severely! Of course proper nutrition is important, but I have found it to be of secondary importance in my case.
I have heard other athletes say that if they mimic the conditions of a race in training, they are less likely to cramp. The article above also suggests that wieght training seems to help reduce cramping as well. I am assuming that the reason these two strategies work is the athlete is training their neurological system to relax their muscles effectively at high intensity.
A focus for me over the winter will be coodination work with the hope this helps the neurological system.
Another very important part of reducing cramping for me has been my ride position. I had to modify my seat height and cleat position slightly due to flexibility issues.
Cheers
Matt