You are one talented bloke with a real eye for composition. What is your favourite lense and what filters do you use to get such vibrant colours?
I'm not Guido but I can say that I my most used lens in Val d'Orcia is a 70-200 followed by a 24-70. As for filters, I've used a polarizer on a few occasions.
The quality of the light in Tuscany is really outstanding!
Have a look at Guido's gallery on PBase, lens info is listed at the bottom of the large photos.