Ah, for short, useful tips. . .

* Pressing “ctrl” “enter” in IE or Firefox adds a “www.” prefix and a “.com” suffix to any address you type in.

* You can also enlarge the entire Web page or document by pressing the Control key as you turn the wheel on top of your mouse. On the Mac, this enlarges the entire screen image.
* The number of megapixels does not determine a camera’s picture quality; that’s a marketing myth. The sensor size is far more important. (Use Google to find it. For example, search for “sensor size Nikon D90.”)
* You can tap the Space bar to scroll down on a Web page one screenful. Add the Shift key to scroll back up.
* When you’re searching for something on the Web using, say, Google, put quotes around phrases that must be searched together. For example, if you put quotes around “electric curtains,” Google won’t waste your time finding one set of Web pages containing the word “electric” and another set containing the word “curtains.”
* You can use Google to do math for you. Just type the equation, like 23*7+15/3=, and hit Enter. Google is also a units-of-measurement and currency converter. Type “teaspoons in 1.3 gallons,” for example, or “euros in 17 dollars.” Click Search to see the answer.
* You can switch from one open program to the next by pressing Alt+Tab (Windows) or Command-Tab (Mac).
* Whatever technology you buy today will be obsolete soon, but you can avoid heartache by learning the cycles. New iPods come out every September. New digital cameras come out in February and October.

*(Thanks http://pogue.blogs.nytimes.com/2008/10/02/tech-tips-for-the-basic-computer-user/?em for these tips)