I have enjoyed the Microsoft Comfort Curve Keyboard 2000. Inexpensive, but relatively comfortable. It looks like this may be discontinued now, but the 3000 is now available. http://www.amazon.com/Microsof...
Duplicity has worked well for me in the past on my linux server.
MPG may not be the most intuitive way to measure fuel efficiency, but it is certainly still linear. 50 MPG actually is 50% less efficient than 75 MPG.
Lowest cost option is to just buy the paperback (used or new), read it, and sell it back on amazon a month later.
But to make money (directly) you have to offer a dubious protection device after scaring them.
Not if you are a news organization that attracts viewers with scary headlines.