Fact is, I actually had some older posts on other blogs that I created for a reason that I don't understand anymore. If you have several blogs on your blogger dashboard and want to merge them, this is what you have to do:
Currently you have to log in to http://draft.blogger.com. There you will find links for export and import on the "Settings | Basic" tab of each blog. It's that easy.
First I was afraid it would also export template information and mess up things, but there was no problem.
As a result, in the archive on the bottom of this page are now 137 additional old posts listed. Starting from the very first post in May 2006. It also imported all the old comments from these times which count 332, so my blog is basically complete now.
And to make Snirgel happy, I also added links to the post feed and comment feed, maybe you wish to subscribe, too.