It might be a good idea to add a note to [url=http://b2evolution.net/man/2004/06/04/file_permissions]http://b2evolution.net/man/2004/06/04/file_permissions[/url] that the permissions on _config.php should be set back to 644 once installation is done (I had someone upload a _config.php file somehow into my blog with the $baseurl changed to some cracker's name).
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I was about to, but Francois wrote the entry, so only he can edit it (him being the only level 10 user round here...).