MacOS – OS X 10.8 Mountain Lion Finder sidebar/Favorites: add MyComputer shortcut

Unfortunately you can not reorder sections in Lion as of 10.7.2. You can only reorder items within the sections. You can also remove items by holding Command and dragging the icon off the Finder window.

I'll create a Apple bug report about this because I think it would be nice to rearrange the sections too!

Update: It looks like you can hack a plist to enable this reordering functionality but do so at your own risk. This will also likely be overridden in a future OS X update.

First, open the trash can by clicking on it in the Dock.
In the Finder, press Command-shift-G (go to folder) and go to ~/.Trash
In the Finder window for .Trash, click the proxy icon in the title bar of the window and drag it to the sidebar.
You then have a trash folder in your sidebar.

To empty the trash from the sidebar, open Automator and create an application. As the sole action in the application, select "Run AppleScript" and use this AppleScript:

on run {}
  tell application "Finder"
    empty the trash
  end tell
end run

Save the application as "Empty Trash", and drag it to the sidebar.