I believe the new edition of the trad climbing guide will soon be issued in English.
Among the great pioneers you missed Roberto Bassi and Luisa Iovane, both rather special. People also tend to forget Stenghel, a very bold and ecentric trad climber.
As regards polish - yes, everthing on Cima Colodri is polished, and all the "easy" (less than local 6c) routes on the bolt crags immediately around Arco town are well marbled. However, there are hundreds of big (scary!) trad routes that are certainly not polished, and there are in fact loads of bolt crags where regrowing vegetation is more of a problem than people - they are hardly visited and some are not even documented. New venues are developed every month and the area is expanding outwards away from Arco town, whch has become expensive and overcrowded (still nice though, in low season). I live up the road towards Trento in Cadine and I have developed 3 small crags a short walking distance from my house. Looking out my front window I can see virgin crags poking up all over the place. And this isn't a particularly rocky area, in fact the locals think I'm daft even bothering to develop here (there is so much more just down the road or up the road, or round the corner).
So, I agree that Arco was initially a victim of it's own success, because the pace of development couldn't keep up with the sudden volumes of people. As new areas are developed and folk realize there are even nicer places nearby, Arco town will start cooling off.
The thing that makes this area really special is the local micro-climate. Winter is way the best season (summer is hot). At the moment the valley daytime weather here (in my village) is like perfect British spring sunshine (with no wind). Drive uphill 25 minutes and you are ski touring (or piste bashing), drive 60 minutes and you are at the bottom of an icefall.
I don't think many places are so well designed.
In reply to Jack Geldard - Assistant Editor: I took my son here in July and camped. It is an excellent location, too hot in July for many of the locations unless you climbed at dawn or in the dark, but despite the polish even the popular venues with normal grades for the below average climber (me) are great. The Guide Arco Rock is OK, but sometimes the descriptions and topos didn't seem to quite match up. I found all Grades above 5 were technical and challenging, but like I said, I'm Mr below average climber. Due to the heat, we bouldered in the evening, sometimes by headtorch, at the climbing training facilities just across the road from the campsite, which has an excellent pool and facilities btw. For variety there are also plenty of via ferrata, including a couple of long vertical ones, kit can be hired or borrowed in town.