In reply to johnbb:
There is still constant development at San Vito. It is definitely worth buying the latest Gebro Verlag guide 4th edition) for the newest crags, especially lots between Bunker and Portella della Vache. There has also been a fair bit of new development at Parco Cerriolo as well as some infills at El Bahira. Some of the new crags above Castelluzo (Corvio etc) are now closed, they were in a nature reserve.
San Vito is now very much the epicentre of Sicilian climbing, the nearby Palermo crags are not as well used these days and are getting a bit green in places. The ambience of some of the city crags is a bit strange, the advice is not to wear sandals in case of needles!
The crags in the south of the island are over 5 hours drive away and are mostly not very good.