capture email address even if user doesn't checkout

[harryhair5]

I think this may be a useful feature for more then just me... after a user adds something to their cart and clicks checkout as guest, they are brought to a page that asks them for their billing address and email. I'm wondering if there's a way to capture the email address via AJAX even before they submit and associate it with the abandoned cart information that AC stores. I could probably cobble together some code to grab the email address and send it back to a page on the server, but how would that then be associated with the about to be abandoned cart in able commerce?