Re: Upgraded to v3 - questions
No change in locking pages, from earlier Tiki versions. I don't think it's ever been possible to lock articles and faqs; you just assign perms to these features to control them.
Just enter the embed url from the Youtube.com page where the video is as the parameter for the plugin.
See the docs on Trackers: http://doc.tikiwiki.org/tiki-index.php?page=Tracker
Not sure about the Google Map locater, without checking. Maybe someone else can answer.
-- Gary