Block

Glad you like it :)

I'll have a look at it, but it will be somewhere next week before I have an answer :/

Easiest solution is to manually add a block and add the following php code:

<?php
  print _taxtreenodes_taxonomy_tree (1, null);
?>

First parameter is the taxonomy id, the second is the description (if null the description of the taxonomy is used).

Set input format to PHP.