I never liked Worldpay - i used to use them about 6-7 years ago when I ran a domain registration company (I sold it as it was too much hassle!) and Worldpay were constantly getting things wrong and allowing fraudulent transactions through, then clawing the money back.
i think Paypal is getting over the stigma it has had, and Google Checkout has the google name behind it so has a bit of a start. I use Checkout and Paypal as of a few weeks ago, so will have to keep an eye on it and see which one people use most.
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