In reply to Dorte:
Hi Dorte
the Ailefroide area is covered in a few guidebooks
1)the Cambon guide Ian mentions above this is the guide that is just for Ailefoide.
2)Briancon climbs (by Roland) this guide is the sports climbing book to the durance valley area, it covers all the single pitch and multi pitch sports route over 3300 across 5 different rock types, and has a chapter on Ailefroide including most of the single and multi pitch sports routes there.
3) Oisans nouveau Oisans Sauvage livre est this is alpine rock guidebook and covers all the big alpine rock type routes on this side of the Ecrins and covers all the multi pitch at Ailefoide.
if you are staying in Ailefroide and just want to climb there the top one is probably best, but if you fancy a day out of the valley or off the granite or up in the mountains the other ones will give you more choice, there is also a bouldering guide to Ailefroide if you are in to that.
I live 25 min's from Ailefroide and happy to help with any advice about the area or climbing
you can drop me a line at rob@dream-trails.com or on here
cheers Rob