My pick for this week is programmable (usually gaming) mice.  I have a 
Logitech G500
and one of the best features is that it has programmable keys.
I have programmed the key nearest my thumb to autotype my email 
address.  This might not sound useful, but if you try and think about 
the number of times a day you type your email address, this has become a 
huge time-saver for me.   This is a simple trick that I would highly 
recommend.