We are going from Naples to Positano in early May and are looking for a car service to pick us up at the Naples airport. Any recommendations for a trustworthy one?
You might try the following 2 web sites, both are I think recommended by Rick.
http://www.monettitaxi17.it/English.htm
http://benvenutolimos.com/indice.asp
We used Monetti's taxi service in 2005. We had pre-arranged for him to meet us at the train station in Naples, which he did. He then drove us to our hotel in Sorrento. We then booked with Monetti for our group of six to do the Amalfi Drive. What a great choice! We had a mini-van, and he took us up to Ravello for lunch, as well as a stop at a ceramic shop without a hard selling host. I'd highly recommend Monetti's. Very fair prices.... I would use them again next trip!