Small things are Sometimes the Big Things
This might seem like a minor thing, however if you have ever tried to select the text in the address bar with the mouse and it just does not quite select it all, then this is the keyboard combo for you.
The ALT key pressed at the same time as the D key will focus you right in the search/address bar. It also selects all text so you can immediately start typing your next search keywords with out touching the mouse at all.
If you are still reading this keyboard combination saves you:
1 left click, 1 left button hold and drag, and 1 delete key
1 left click, 1 left button hold and drag, 1 right click, 1 left mouse drag select and 1 left click.