I'm currently using Ryan's plugin on my site - It's a great plugin - I was looking for something like this for a long time.
Because Ryan's been busy with the popularity of his plugin and because he's been great with helping me, I thought I would post the fix for the "email input box" issue that he sent me last night so that people can continue to use this great plugin.
The problem appears to be a conflict with any theme that uses the same label for "email" - try making the following changes to
wp-contactform.php version 1.1 and it should correct the problem:
In lines 16 & 82:
In line 139: