If you're a big Google user, Google has put up a site with a collection of tips to help you get the most out of various Google products. The tips are on several little cards, and you an easily and quickly flip through them. They also can be sorted by Google product or by category, such as "at home" or "at the office."
This is a great way to find out about some lesser known Google features, and become more of a Google power user. It's also the time of year to be the hero to family and friends, and these tips can make it easier to help them while you're visiting for the holidays. Check out these tips at google.com/get/googletips.
For more on Google Tips, check out The Social Hour episode 140 with Amber MacArthur and Sarah Lane.