Google is giving away a free (plus the cost of a stamp) Gmail-related sticker kit, including a page of stickers for your keyboard to train your fingers with the popular email client's handy keyboard shortcuts. According to the blog, the adhesive from the shortcut stickers "is a bit more removable than standard stickiness, so you can take them off once you've trained your fingers."
To get some of your own, just send a self-addressed stamped envelope (old-school, right?) to:
Send me some Gmail stickers already
P.O. Box 391420
Mountain View, CA 94039-1420
Make sure to include enough postage to return a sticker pack via U.S. mail. It's less than one ounce, so a standard $0.42 stamp will do if you're in the United States; enclose an international reply coupon (IRC) if you're outside of the U.S. And be sure to send your envelope in soon -- one per person please.