I have the 3.0.1 WordPress version and downloaded the 1.6.2 version of Nextgen.
I still get the "Sorry, NextGEN Gallery works only under WordPress 3.0 or higher" error message after activating Nextgen.
I tried to update
var $minium_WP = '3.0';
var $minium_WP = '3.0.1';
in nggalery.php by it does not change anything.
Could you help me to active this nice plug in please?