I recently started seeing a lot of strange characters appearing in my WordPress posts since upgrading to a recent 3.2 beta. Some of the symbols were and Ã¢â‚¬â„¢.
I did a quick search and found that if you comment out two lines in your wp-config.php file it corrects the problem.
Comment out the following two lines.
Once commented out you will see the changes instantly reflected. Problem solved