
Other websites
General information
The Virtual Alps is probably the best place on the Internet to start for getting inspiration and ideas of where to go oneself!
Club des Cent Cols again have a wealth of online free information. Their map overlays for France and Switzerland are especially valuable for pass collectors (See the Calques section.) To gain real value of the overlays you do well to buy releavant pass guides in their boutique! They also have other intresting information on special passes and some photos.
OCD Cycloclimbing (from where I borrowed the name for this site) are in the process of setting up very informative pass guides online and already have the guide for the Western Pyrenees up (public beta). See also their link sections for much important additional information on passes all around. Do not miss Fred Wrights Alpine Roughstuff page perhaps the most memorable photos on the web!
Our third organisation BIG also prides themselves of having a lot of information online. Of special interest is the Passacol sub-site.
Edwin Seldenthuis site Pass a Pass has a lot of information on passes with his own profiles of climbs.
An Italian cycloclimbing organisation Unione Internazionale Cicloscalatori (UCI) has some information and many photos of interesting passes on their web page.
A more commercial/community style site, in the German language, is Quäldich.de a site that has improved a lot recently (due to much reader input).
Another similar site is CyclingCols.com .
Difficult climbs
Challenging Road Climbs version one and version two. These lists are always of interest to the cycloclimber in search for challening climbs.
Another site that tries to categorize climbs by how hard they are is Claudio Montefuscos Los puertos más duros de Europa
Club des Cent Cols has an interesting document on how to calculate steepness (there are others) with some rankings.
The profile sites also mostly have rankings. All rankings are usually very contradictory and in my opinion they are of no special interest, but they could anyway serve to give an idea of Challenging climbs.
Personal web sites of special interest
Marc Liaudon has maps of pass locations in France, Spain, Switzerland and the US plus a wealth of other interesting information.
Gerd Balser has information on more passes than (more than 450) on this site (currently) and a lot of photos/videos. (German)
Jean Philippe Battu has a lot of interesting information on climbs in France. His old site has much information which is not found on his new site, like the best description of Col de Solude on the web.
André Rudaz has information on many interesting passes in Switzerland and elsewhere. (French, Italian)
Patrick Schleppi has a very fine and updated website in several languages.
Carstens Cycling Web has short descriptions on many passes and some thoughts on equipment.
Mario Labelle gave me much inspiration when I started out on my early adventures in the Alps.
Lodging
Gîtes de France official page for this popular lodging alternative for cyclists and walkers in the French mountains.
Montagna Piemonte has links to the official pages for every administrative region of Piemonte and many of those pages have lists of lodgings in their area. (Italian)
Valle dAosta has listings of accomodations in the Aosta valley.
Club Alpino Italiano could be searched for mountain huts and other lodging in Italy.
Südtirol is the site to visit for finding relevant lodging in the Dolomites and nearby.
Mountain huts around the Alps
Various
Zani Bike has much information on climbs in Valle Camonica and Valtellina in Italy. There is also good information on great climbs like Passo di Baremone and Passo San Marco.
Roobsta.com with information on climbs in the Alps and the Pyrenées.
Die schönsten Paßstrassen Europas and Die Alpentourer are two of several motorcycling pages on passes in the Alps that has many photos. (German, of course ;-))
Biken im Oberwallis is an interesting website wit descriptions of routes mostly for MTB in Wallis. (German)
If you are looking into climbing some gravel roads, it might be well to look into a site like Mountain Bike in Piemonte or Liguriabike.it
The classic resource Trento Bike Pages still has one of the most extensive archives of travelogues and cycling information from all around, but also very much on the Alps and the Pyrenées.