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Recent figures indicate that around half of all potential customers bail out during the checkout process.
While there are several reasons for this, including uncontrollable ones like users checking delivery charges or comparison shopping, usabilty problems at the checkout are also partly to blame.
We list ten ways to make the checkout process smoother and reduce abandonment after the jump:

As well as providing the shipping date, and estimated delivery time may be useful, and will prevent customers becoming too impatient. This, provided by grokdotcom, is an excellent example.
Display signs of server security
You don’t want to give customers any doubts about the security of your website and the payment process, so display third party verification logos and links to information on what they mean, https on url, make sure you have a visible address bar and status bar, and show security icons on transaction pages.
Make data entry logical
There are several things when inputting address/card information that could frustrate customers so much that they abandon the checkout process. Removing as many sources of friction as possible will help reduce abandonment.
This includes automatically populating the delivery address section with the address given by customers when adding billing information.
In addition, letting customers navigate back and forth through the stages of the checkout process without losing all the information they have inputted will remove one source of frustration.
Prominent phone number / contact details
This is crucial for engendering trust in the purchase process, as many customers would be reluctant to buy from a website that lacks contact details.
This is basic stuff, but many online retailers in the UK are not doing this - a recent survey found that 60% of UK online retailers provided no telephone number on their website, 43% displayed no business address, while 39% had no contact email address.
Related stories:
House of Fraser - a user experience review
Warning: I can't find your checkout!
Related research:
Online Retail 2007: Checkout Special
What about pop-up blockers... surely this would not work?