The fourth-gen iPod Shuffle is noticeably smaller, slimmer, and more square, measuring 1.24 inches wide, 1.14 inches tall, and 0.34 inch thick.

Another design feature that distinguishes the fourth-gen Shuffle from the second-gen is that the majority of the physical features--the headphone jack, the power switch, the battery indicator, the playback mode control, and the VoiceOver button--have been consolidated to the top edge of the device.

For the fourth-generation version of the iPod Shuffle, Apple has thrown out the design from 2009, returning to a form that is similar (but not identical) to the popular second-generation model.

In spite of the shrunken body, the main navigation has actually increased just slightly in size compared with the second-gen version it's modeled after, making it easier to make any adjustments to volume or track position.

If we have just one complaint of the fourth-gen iPod Shuffle design, it's the difficulty using the clip without accidentally triggering the track skip control (specifically the back skip button).

Though the Shuffle's design may be a nod to the past, its features keep pushing forward. Everything that was good about the third-generation model (VoiceOver, playlists, audiobooks, and podcasts) has been retained for this version, along with support for Genius Mixes, expanded language support, and a longer 15-hour battery life.

In terms of features, design, sound quality, and price, the fourth-generation iPod Shuffle is the best version of the player we've seen yet.

Here, you can see the fourth-generation iPod Shuffle (left) next the the sixth-generation iPod Nano (middle) and the fifth-generation iPod Nano (right).