Thanks everybody for pinging me. I didn't even remember I forked that script there...  Anyway, I looked into it and it seems to work again, except for two small details:

* There are no images for 2013 yet.

* The script expects all images to be in a single category. I didn't find a simple way to get images in a sub-category using the api, i.e. https://commons.wikimedia.org/w/api.php?action=query&generator=categorymembers&gcmtitle=Category:Images_from_Wiki_Loves_Monuments&prop=imageinfo&gcmlimit=500&gcmnamespace=6 doesn't work if images aren't directly in the main category. Any Ideas how I get them using the API without having to recursively go through all subcategories? https://www.mediawiki.org/wiki/API:Categorymembers doesn't help too much.

Please feel free to fork the script if you like, you can just grab it with wget.

//Holger