Viewing the current passwords of members is impossible as they are not available in plain text.
You could setup vB to also sent the unencrypted passwords, but sending unencrypted passwords over the internet, is a huge security vulnerability. Once the unencrypted passwords are sent to the server, you could catch the variable and store it in a new database column.
to enable sending unencrypted passwords, add the following line to your config.php:
PHP Code:
define('DISABLE_PASSWORD_CLEARING', true);