Spending less time on the computer
My grandmother always complains about how long it takes to do anything at all on the computer - and after watching her in action I think that this is largely because of the number of clicks needed, just to get to google in order to perform a search.
If you use the Australian computer program "[b]Big Buttons[/b]" (www.bigbuttons.com.au) most tasks can be completed with far less work, saving you time and meaning less time on the computer.
Of course, if you want to spend more time on the computer, using [b]Big Buttons[/b] can make that time less stressful for you.
Also, the keyboard short-cut "Control + Z" (holding down the Control button, then pressing "Z") is a short-cut for "undo"... so if you're typing a letter or even a post on a forum and you make a mistake, don't waste time deleting everything manually, just go back to the last step by using that shortcut!
... and if you want to undo what you've undone, use the Control + Y shortcut.