Right, here is a bit of gold,
DONT FORCE A USER TO GIVE MORE INFORMATION THAN IS NEEDED TO TAKE PAYMENT AND DELIVER THE GOODS!,
apart from the email, and I can say that with utter confidence as this is how we used to run our mobile phone accessories.
just got all teary eyed when i looked back at it
http://web.archive.org/web/20021123054401/www.mobileaddons.com/
Anyway, our final iteration of the 'greed robot went' like this, completely open shoping cart, but we then offered a 10% discount to the pre checkout page if you enetered your email address, this was before the actual payment page. This was generally stated to be for special offer announcements and mailing list, as well as to help with the order any just shy of 100% of users took the option of a 10% prior to actually deciding to pay.
Wow amazing I'm hearing you say.
OK well we ran on a drop out rate of about 80% of our carts before doing anything to try and capture those lost soles. So as part of solving that we problem we did this, starting off buy emailing back failed orders with a reminder, we started to remove any lots completed carts. Then to maximise on this we emailed twice, second time with a discount of 25%, better still. Then epiphany moment, we added the 10% discount for email on the basket before ever entering any details and we ended reclaiming a huge chunk of those lost carts, as we could then email a reminder and then 25% discount 72 hours later to people who had only priced up the goods without even trying to purchase.
Bonza.
Hope this helps anyone whos having difficulties with lost carts.
D