Hello,
Well, the developpement of PowerTools is allready at version 2008, so, shurely, PT 2006 will not be improved anymore.
But if you will give a try to PT 2008 - of course this will cost you an upgrade fee of 6.95 $ - just wait to download till the other week as there will be released a new version with some bugfixes.
(The actuel version is 1.8.0.446)
Best regards
Jean-Paul