This plugin replaces the existing WordPress dashboard with an ajax homepage style of dashboard.
This plugin requires jQuery to be available. jQuery is available as standard on WordPress versions 2.2 and above, so ideally you should upgrade your WordPress installation to the latest versions prior to installing the myDashboard plugin. I have included a jQuery distribution with the plugin, so it "may" work with WordPress versions prior to 2.2 but it hasn't been fully tested.
Yes, please visit the development site at http://dev.clearskys.net for details on how to develop your own gadets.
At the moment, no. But I may try to incorporate a parser for igoogle gadgets in the near future.