Why on earth have you messed up the widgets so badly by making the interface so awkward -- and just about eliminating the ability to move widgets between sidebars?
This is totally stupid, to be blunt about it.
There are some nice, clean features in 2.5 that I appreciate. It seems to load posts and work faster. It seems to publish faster.
But the way you have done it now, there's no easy, practical way to move a widget from sidebar 1 to sidebar 2, etc., is there??
Please, I'm begging you, find a way to restore this capability -- or if it's there, make it apparent.