I just noticed that stuff on my blog (which was hosted on URLold and now is hosted on URLnew) still points to URLold.
A quick inspection has shown that this is not a cache issue. When I look into the database, I can see that Wordpress introduced hard links for images like URLold/path/to/whatever/foto.jpg and similar stuff for other content.
The probably dumbest solution would be to replace all appearances of URLold with URLnew using sed or just an editor but ... there must be a better way? They cannot make their users edit the data base when the site migrates from URLold to URLnew. Right?