Is it bad to turn it off? I turn mine off every night (same as my iPhone usually)....... I have two kids to take care of so if I turn it on while they are napping or playing I will usually turn it off after since I know I may not get back to using it later....
I am in agreement with the other posts but wanted to mention that most of you probably bought a cover that will turn it off, "temporarily" or puts it in "stand by" mode when you close it. It keeps you from using power while it is closed, at least it appears to save your battery power while it is closed. You can hear it click when you close the cover which I think, indicates it is in stand by mode.