I also get the notices reported by Christian.
- I don't like very much these setters that just assign the value to a public var (setVerbose, setHumanReadable...etc), they are quite useless imho;
- you should declare these public class variables at class level (eg. public $verbose = false;);
- imho HTML_Table and Console_Table should be optional requirements (if Console_Table is installed use it and if not the result is tableless).
Otherwise nice package.