WordPress Suicide is a useful plugin, particularly if you are running tests on your freshly installed WordPress.
Also, if you are trying to import your posts and comments from the New Blogger this could prove useful – if you are unlucky to have problems during your import. Some people succeed the first time, but some do have problems.
As for the importer, I am trying to find time to update it to include features that were requested by users. Currently I can only fix important bugs, if found. It’s currently in version 0.5.
If I had found this plugin earlier I would have recommended it too.