Are there symbols and characters you would like to use that are not on your keyboard?
Such as: http://www.postimage.org/image.php?v=aVbaCC9
If so, head on over to http://copypastecharacter.com/ and those characters will be displayed and just click on the one you want to use and it will be copied to your clipboard so you can paste it into your text document.
Windows users have a similar set built into Windows. Open the start menu and type "character map" into the search field. The character map box comes up with a large selection of symbols you won't find on a keyboard. You can copy and paste them. I made a shortcut icon to my character map I keep on the desktop for easy access. I never could find the symbol for pi I was looking for the other day.
I'll bookmark this one Cris.