Whatever you think of the new Gmail compose feature, it' always useful to open an email in a new tab. Clicking Ctrl allows you to do just that. These are the Ctrl - clicks that open a new tab:
Using Shift instead of Ctrl opens in a new window.
Let us know what you think about this tip, or if you find any more places you can use the Ctrl button to open a new tab in Gmail, in the Comments below.