Gadget giants: iPad 2 and Nintendo 3DS released
Gadget sales are expected to set a new record as two of this year's most hyped products hit the stores on the same day.
The Nintendo 3DS, which allows users to play games in 3D without wearing glasses, went on sale at midnight. Apple's slimmer iPad 2 is released later.
Thousands of people have queued overnight to get their hands on the technology.
Technology correspondent Rory Cellan-Jones takes a look.