Change:
<form method='post' action='http://www.indiegamebusiness.com/newsletter.subscribe.php'>
to
<form method='post' action='mailto:[your email address]'>
You will be better creating a php script to re-direct it though - because if you send it directly to your e-mail address, users will have the information sent via Outlook as an e-mail (or they wont be able to send it if they don't have an e-mail client).
<form method='post' action='http://www.indiegamebusiness.com/newsletter.subscribe.php'>
to
<form method='post' action='mailto:[your email address]'>
You will be better creating a php script to re-direct it though - because if you send it directly to your e-mail address, users will have the information sent via Outlook as an e-mail (or they wont be able to send it if they don't have an e-mail client).