Tabbed vs. MDI (Toolbar vs individual windows)
This is extremely simple, but I'm often surprised how many developers are debugging an issue but only looking at one query at a time. They often forget the exact item they are looking for. I switched to a windowed view a long time ago and found it useful to hold information in the background.
The default view in the Management Studio is to use tabs for all the queries (see snapshot). I know some developers like to see one statement at a time, but I'm usually referencing more than one query at a time.
To change the layout of the queries, chose Tools > Options from the menu. The first item under Environment gives you the option to switch between Tabbed documents and MDI (windowed).
Here is the result, all the queries are no longer in a tabbed view:
