I just noticed throught Eclipse that ADT had been updated.
The new ADT version brings some nice touches to the layout editor.
Now you can select items and drag and drop them onto the layout. It’s a nice touch that will certainly help new android developers a lot.
To get the new features, in eclipse go to Help and then Check for updates.
You can read more in the ADT changelog.
They have also tweaked the XML formatting. Which is always a good thing
I ran a quick test with a drawer layout on Android 4.0: