I have installed 2.6 on a testblog. Mainly because I no longer trust WP and didn't want to wreck my current live blog.
It was a good call on my part...
First issue I hit (aside from the fact that the widgets area is crap) was that I couldn't REMOVE a widget from the bar I put it on.
I logged into IE and that seemed to solve it for some reason. Go figure. I see the links in Firefox too, now.
Put the remove as an option where you put the edit maybe, on the widget button? Or is that too dangerous?
Actually, it is, if you look at the example below.
Right, now here goes.
I completely, utterly and totally do not follow where you are going with this.
WHY do you make me REMOVE a widget from a bar, lose ALL the settings from it, before I can add it to another bar?
Previously (2.3.3.) I just dragged the widget to the other sidebar, saved changes, and hey presto, it was done.
I'll use a text widget as an example, since chances are there are multiples of those.
Add widget to sidebar 1.
Set up widget. (put text in etc)
Oh oops, I need it on sidebar 2!
Remove widget from sidebar 1
Switch widget view to sidebar 2
Ah. No more settings...
Set up widget (redoing text because I didn't copy it first)
Hit wall and curse WP for changing the drag and drop between bars and forcing me to redo a widget if I dare to want to move it!
All I can say is - Way to go. Whoever came up with this... sorry pal, but that ISN'T productive.