John Brandt’s Special Character Shortcuts (free) is a comprehensive PDF that shows how to access almost any special character in any font. The 16-page PDF includes cheatsheets for accented characters, ligatures, punctuation, currency, legal symbols, math, and greek symbols. Print out the pages for the characters you forget most often, and post them near your computer.
Keystrokes are listed for Mac and Windows, as well as HTML codes for web pages. There is also a special section on special nonprinting characters in QuarkXPress 7 and 8, and a handy typographer’s glossary.
Source: This tip comes from the August 2008 issue of Design Tools Monthly. All Seattle-area support clients CreativeTechs receive a complimentary subscription to Design Tools Monthly in their monthly green envelope.