keljonma, I like to can for the same reason. Once it is canned, you don't have to worry about using power (that you have to pay for) to keep it. And you don't have to worry about the power going out.
I never thought about canning it before. But I will do so now, makes perfect sense.
I also use it for cleaning. Especially in the kitchen. Keeps my counters and sink amazingly nice and stain free. I have an old formica counter. The pattern has been worn off and the lemon juice works great on it. I just go out and pick a couple after doing the dishes and use one in the kitchen and keep the other for use throughout the day. Kitchen smells nice after too, unlike amonia or lysol or bleach.
Lemons will also take stains out of fabric. It might bleach the fabric too though, so it is a good idea to test it first.
Lemon makes a good substitute for vinegar in salad dressing.
Lemon juice will help disolve hard water stains and soap scum.
Have surprise company coming? put some cut up lemon or orange in a pot of water with a dash of cinnamon, put on simmer. Makes the house smell nice and fresh.
Feel the doldrums at the office after lunch. Scratch and sniff a lemon. Will give you a litte pick-me-up. And your co-workers will wonder what you been drinking for lunch

That's all I can think of for now.