Since I have lots of old keys floating around (2 or 3 on the PGP keyservers, 2 as well on the GPG keyservers) that are all no longer active - among other things because I haven't had those hard drives or floppy disks for a long time. So I created a new key again to complete the confusion.
But I haven't uploaded this one to the keyservers - at least not for now - only linked it in the imprint. Anyone who wants to use a previously unknown key has to contact the owner first anyway to check if it's the right, genuine key.
Let's see how long this key survives my forgetfulness until I eventually destroy it for good. On the other hand, things have changed for me: I now have backups.
(and I've backed up the key on a memory stick and carry it with me on my PDA)