My brother sent me an Amazon.ca gift-certificate for my birthday. He was probably thinking that I could use it to buy e-books for my new Kindle. Only I can't, because to buy e-books I've got to use the Kindle shop at either Amazon.com or Amazon.uk, and Amazon gift-tokens cannot be transferred from one of their domains to another. He wasn't to know this, but you'd think Amazon.ca could flag up "Hey, if you buy a gift-certificate here it can't be used for e-books!".