In reply to Hendofan:
Not exactly an app, but it is possible to get alpine route descriptions onto your phone for free. To see selected easier routes for the Mont Blanc region go to the www.funalps.com site, scroll down until you get to the blue titles for the different types of outings, e.g. rock climbing, ski touring etc, and select the list you want. Place this in i-books. Selected your chosen route from the list and this will link you to a "mobile" version of a route description in English from the camptocamp.org site. Works on my wife's i-phone 3, but have not got it working on my Samsung Galaxy Y, because of the way it handles links in pdf files.
Making the whole thing more user friendly should not be too difficult if there was any demand for it.