I agree totally with AfterBurner.
I think that after the first year's membership in a given level has passed, the airline should just send the member new bagtags and a membership card, and a link to a Acrobat PDF file that contains all the info for that year's membership level.
After the thrill of getting the fancy kit the first year has passed, who needs another one? Besides, a PDF file weighs a lot less that a booklet (for the purpose of carrying it around with you for the next 12 months).
If Air Canada provided an option on the profile page of the Aeroplan website to "opt out" of mailings (e.g. opt out of getting Super Elite statements every month, opt out of getting fancy kits each year), I think they would save a lot of money, because quite a few of us would choose to opt out.