Apple's slate PC finally launched in the UK last week, after being delayed by a month due to "surprisingly strong" US demand.
"Customers around the world are experiencing the magic of iPad, and seem to be loving it as much as we do," said Steve Jobs, Apple's CEO.
"We appreciate their patience, and are working hard to build enough iPads for everyone."
The iPad is on sale at Apple Stores across the UK, as well as Currys, Dixons and PC World outlets following a deal signed by DSGi last week that gives the electronics retailers a 60-day head start over competing vendors.
As well as the UK, Apple began shipping iPad in Australia, Canada, France, Germany, Italy, Japan, Spain and Switzerland last week. It said the device will be available in nine more countries in July and additional countries later this year.
Apple revealed in May it had sold one million iPads just 28 days after the product's US launch.