Windows 7 Explorer shortcut for "Replace All"
I you copy/paste some files into a directory that already contains files with the same name you'll get a confirmation dialog "There is already a file with the same name in this location..."
To replace all files you have to check "Do this for the next N conflicts" and then click on "Copy and Replace".
Is there a keyboard shortcut for this (like there was in XP where you could simply press 'a')?
Alt+D, Tab, Enter.
Alt+D will select the option.
The description has an underlined "D" on "Do this for the next N conflicts."