ViewFontX is a small application that allows you to see every ASCII character (in any size, font and style you select) of any installed font, and will also show what the exact keystrokes are needed to type the character. You can also print these handy tables for quick reference.
You can select one character from the Main Window to find out what key combination will give you that character from the keyboard. Select the "Keys" tab to show a list of all ASCII characters and the key combinations to access them, the list can also be printed (but to do so, you must click any item in the list). Select the "Grid" tab to show a grid of all ASCII characters and the key combinations to access them.