I keep the following list printed out and taped to the side of my monitor for easy reference. If you want to use the "¼" character, just hold down the ALT key and then type the numbers 0188. Give it a try. Very cool trick.

« Alt 0171
» Alt 0187
× Alt 0215
÷ Alt 0247
¢ Alt 0162
£ Alt 0163
¥ Alt 0165
© Alt 0169
® Alt 0174
• Alt 0149
… Alt 0133
¼ Alt 0188
½ Alt 0189
¾ Alt 0190
¹ Alt 0185
² Alt 0178
³ Alt 0179
º Alt 0186
Ø Alt 0216
™ Alt 0153