Hi there,
this plugin works fine, just as told.
BUT:
When applying the {categorylinks} tag on the Output Settings admin page, categories come without a whitespace between them. For example, if a posting, which is mentioned to be similar, is in the two categories "foo" and "bar", output will be: foobar
To avoid this, I had to add a non-breaking whitespace ( ) at the end of line 424 (after the closing <a> tag) in output_tags.php of the Post-Plugin Library plugin.
So long, Thomas