A couple of links to (quite short, unfortunately) Marlin configuration guides:
- (in English): http://airtripper.com/1145/marlin-firmware-v1-basic-configuration-set-up-guide/
- (in French / en Français): http://blogelectro.free.fr/blog/index.php?post/2012/10/31/Marlin%3A-un-firmware-pour-Reprap
Note that you can always ask questions about Marlin on the reprap.org forum in the appropriate section.
As time permits, I will start adding to the Configuration section, until there is at least a semblance of a Marlin Configuration Guide (which can then be moved to a separate page).
If you want to contribute to this page, please add to or update the already existing material, and please do not remove or delete information replacing it with pointers to external websites (which may or may not be accessible to users of the reprap.org wiki).