The best thing you can do for your camera, is use it regularly. In the event that your going to store it away, don't leave it in the camera bag, or case. Take out the batteries (Not the internal one's in the T series). Wrap the camera in a clean soft cloth, and store it in a cool dry, dust free place. If your storing only the body, don't forget the body cap. If you've lost that - (hey, it happens) - you can buy a 49mm lens cap which works fine.

Your camera really hates sunlight and hot places like your car dash and trunk. Also - please don't store in the area of corrosive chemicals.

To keep your Canon is great condition during long periods of non-use, Occasionally insert the battery(s) and take several blank shots to "exercise" it. I suggest monthly... at least.

Of course it's a rugged FD, that Canon of yours,  reliable under "normal" use. But now it's a "senior citizen"  and can be damaged by water, spray, humidity, sand and shock. (You should see some of the camera's I buy... ugh!). Clean the Canon very carefully, if your using it in an area of dust or salt spray. 

	If you drop the camera into the water, it will make a great paper-weight or door stopper.
	Nobody around has any parts to fix these anymore.  Not a wise idea to loan it to the kids for show and tell, or grandma to take a few snaps during her bus trip.

If you use the Canon in very cold temperatures - (ie: Siberia or Edmonton?) trying to get a shot of the dog frozen to the fire hydrant...?

Try to protect it from the outside air at the very least. Condensation forming on the Lens, mirror or prism will freeze and cause grief, breakage and corrosion.  To avoid this, use your inexpensive digital, that you can keep in your shirt pocket... or... while still outdoors, put the Canon in a plastic bag (Like a zip-loc), seal it.. and take it inside until it thaws. - likely half an hour.