Please also point out in the manual that no modifier key is necessary. Mac users, for example, are used to pressing the Command key with a letter for common keyboard shortcuts.
It took me this long to work out that I only have to press the letter key itself. In list view, you press A to add books, E to edit the one which is selected, D to send it to the device, S to save it, C to convert it, V to view it, and O to open the containing folder.
A quick paragraph on keyboard shortcuts would be very welcome in the manual. If the manual is HTML, is this useful?
Code:
<h2>Keyboard Shortcuts</h2>
<p>Calibre has several keyboard shortcuts to save you time and mouse movement. These shortcuts are active in list view (when you're not editing the details of a particular book), and most of them affect the title you have selected.</p>
<p><i>Note: the basic Calibre keyboard shortcuts do not require a modifier key (Command, Option, Control etc.). You only need to press the letter key, e.g. E to edit.</i></p>
<h3>Basic Keyboard Shortcuts</h3>
<ul>
<li><b>A</b>: Add books</li>
<li><b>C</b>: Convert books</li>
<li><b>D</b>: send to Device</li>
<li><b>E</b>: Edit metadata</li>
<li><b>I</b>: get Info</li>
<li><b>O</b>: Open book folder</li>
<li><b>S</b>: Save to disk</li>
<li><b>V</b>: View</li>
</ul>
<p>Inside the menus, you will find other keyboard shortcuts, most of which <i>do</i> use modifier keys. These are handy when you do a specific action often.</p>
I don't know if you want to add info on the submenu commands. This is a start. You could also link them to the sections on each function.