Apple, which unveiled a new £199 16GB iPod touch this week, has just announced that 100 million iPod touch units have been sold since the first model launched in 2007.

While hardly on a scale with the sorts of figures boasted by the iPhone and iPad, it's an impressive performance by what has always been thought of as a bridging product: an iPhone without the phone, a mini iPad, an iPod with apps. Few people - except for kids, a market that the iPod touch has always done well in - would think of the iPod touch as their ideal portable device. But its price tag, sensible blend of features and slim design give it plenty of appeal.

How will it fare in future? That's harder to say, given the iPad mini's success; I for one think the iPad mini is a fair contender to become Apple's most popular portable form factor. This may explain why Apple chose to take the rear-facing camera from its lowest-capacity iPod touch and reposition it as a cheap FaceTime and gaming device.

Read more about the new budget 16GB iPod touch in our review.

New iPod touch