There, I fixed it: delicious
Someday in October, my delicious import to this blog stopped working. Due to high demand @ work, I wasn’t able to fix this until now.
The source of the problem was a (afaik unanounced) change in the delicious API, probably due to the owner-change.
Whereas it was possible to fetch links from a certain date by specifying „YYYY-MM-DD”, delicious now demands the „whole” datestring as documented: „YYY-MM-DDThh:mm:ssZ”.
Once I changed/added that, the import worked and I am a happy camper again.