In reply to Wildabeast:
Morocco Rock, the Paul Donnithorne/Emma Alsford guide book, with on-line supplement, is indeed excellent and provides a comprehensive view of the climbing in the area that's become known as "The North Side", meaning the valleys to be found to the North and East of Jebel el Kest, the mountain massif which holds the bulk of Anti-Atlas climbing that has been developed to date. Based at the Kasbah Tizourgane you could have a great trip without looking any further.
However your mention of Asgour leads me to mention that you won't find it and surrounding climbing areas in Morocco Rock since it is firmly in The Ameln Valley to the South of Jebel el Kest, and is where the discovery of quartzite climbing in the region began. For this area the guide books have been published by Steve Broadbent of climb-tafraout.com. They are about to publish a new volume covering the whole area, North and South. It's to be available at the end of this week.
See you there - we'll be there late March/early April staying in Tafraoute as usual with maybe a few days at The Kasbah.