Here is one quick handy fix for the WordPress widget screen layout.
I found the actual admin widget layout bit stupid. Giving a grate space to unused widgets rather then give us a space to work with the widgets in the sidebars we use.
So I made this small fix. It is just a raw CSS hack, but the widget screen is much much better and easier to work with.
(The next step might will be to rearrange the sidebars so that they somehow matches to the front-end layout, maybe layouts.. meaning that there will even be a tab for widgets view.
I hope WP developers come up with this solution them selves)
You can find this feature in the new 2046′s loop widget 0.253