Some menu items, such as Media and Links, I rarely use. I'm sure there are other items which others rarely use, or use often. It would be nice to be able to order, perhaps via drag and drop, the main menu tabs in the admin panel.
I am referring to the Posts, Pages, Settings, etc.
In addition to that, some plugin authors sit there menu item at the bottom of the column, forcing you to scroll down to access the menu item, even tho it may be just as important as Posts to you.