In reply to jhw:
> Is there good stuff at all levels (particularly stuff 5a and below...)?
There are plenty of slabby plods, particularly in the Gorros area, which are of interest more for their mountaineering, lost-in-a-sea-of-rock feel, and less for their interesting climbing.
> Is it polished
In places, though the nature of conglomerate slabs means that everyone climbs each route a slightly different way.
> does it get busy
on the easier, and most easily accessed routes, yes it can get very busy. Though if you are prepared to walk a bit, you will be along quite quickly.
> when is the best time to go
Spring or late autumn
> is it possible to camp on the mountain and use the monastery cafe, or would I need to either camp in the valley or stay in the monastery hotel?
there is a campsite at the monastery, but I think it's not open during the winter. There are several refugios, ranging from extremely basic to very comfortable, all around the mountain. The traditional 'climbers' refuge is Sant Benet, it has a good vibe but is very basic. You can wild-camp/doss in a variety of caves around the mountain, make no noise and no one will bother you. The monastery in general is extorsionately expensive, most climbers avoid it.
> Has an English guidebook been published yet or do I need to bring a Spanish speaking friend?
AFAIK there is no english guidebook. There is a large variety of Spanish ones, mostly with reasonable information, though don't expect rockfax quality. There are also topos in all the refuges (and some local bars) where you can copy information by hand.
Have fun!