9 - Ask others what they did. It never hurts to ask how others are surviving the countless thank you notes. They may have a cool tip you've never thought about or way to phrase a thank you for a shocking, tacky or disturbing gift.
10 - Consider the size of your stationary. Obviously the smaller the note the less you have to write! Similarly the bigger you write, the less you have to say. ;-)
How did YOU stay genuine, motivated, and inspired to write bridal thank you notes?