If you like electricity, this is worth reading
Legal- I don't want anybody going to jail. It is expensive, time consuming and it would make me sad to be apart from my wife or family.
Safety- This is important because dealing with electricity like this can kill myself or somebody else. (If it meet's code, it should be safe and legal.)
Simple- I am an engineer. There will be times when I have to go away from home for a business trip. I want to ensure that my wife, or children (when the day comes they are responsible enough) are capable of doing this while I am away, without any doubt it is done safely and in a legal manner.
What is it?
Extension cords: You can run extension cords to all of your (110 to 120 volt) appliances while the generator is running. This is a very economical option, still legal, and relatively safe. I won't look down on anybody who chooses to go this method. (Unfortunately, I don't believe this is a good option when I am required to power things like my 240 volt well pump.)
Back-feed a breaker: THIS IS ILLEGAL, THIS IS NOT SAFE. I won't even speak of it. If you want more information on this, check out Steven Harris's page here.