If anyone wants to go trekking in Morocco, a very good guide is Boujemaa Boudaoud (Boujemaatoumliline@yahoo.fr, or look at http://boujmaa.free.fr/index.htm if you understand French - he speaks English (and German and Spanish), but the website is in French) - he charges DH300 per day for tours in the Sahara/Atlas mountains.
Also, if you are looking for a place to stay near Ain Leuh (not far from Azrou), there is an auberge called Le Magot de l'Atlas, can contact them at aubergelemagot@hotmail.com (though definitely better off speaking French there!)

Thanks for the info, Aardvaka! Trekking is really fun in Morocco. Aside from that there a lot of things that you can do in the country. Me? I enjoyed shopping at the markets of the country's Medinas!