In reply to Martin Haworth:
The Dolomites is a massive and varied zone, and each area offers its own special charm.
Millions head for Canazei and Sella Towers, which is fine but very busy in high season.
Not many foreigners seem to know that Val Canali has the best rock of all the Dollies, and overall the Pale di San Martino (a massive group in its own right) is probably the single area that offers the best of everything (in my view, obviously), with possibilities for some absolutely "out there on your own" multi day trips, "normal" Dolly one dayers, incredible peaks to scale, and (wait for it) trad climbing on massive rhyolite style cliffs (porphyry, but similar) and even pink granite walls nearby (roadside or hut based).
For an idea of what this group offers see the recently translated Trad Climbing in the Dolomites guides by Montagna Nuova and the new Versant Sud Lagorai guide. If you are good at Italian then see the 2 new CAI guides for Pale di San Martino and the one for the Lagorai.
Having said all that, my favourite are is the Brenta, probably because it starts from my back door - all very poorly documented, but keep you eyes open over the next year or so ...
The new route options are still more or less infinite - in fact with modern climbing standards the Dollies offer no end of crazy overhanging rock.
If it rains you want to go to the Sarca Valley, but that is another story.