Still screenless, the second generation iPod Shuffle is, according to Steve Jobs, the smallest MP3 player in the world.

Specifications

Battery
Battery type Lithion ion
Claimed battery life 12 hours

General
Headphone type Earbud
Expandable memory No
FM tuner No
Recorder No
Storage capacity 1 GB

Physical Features
Weight14 g

Review

Pros: Sure, it's tiny...
Cons: ... but it's so small it appears to be more of an inconvenience rather than a snazzy toy.
Opinion: When does small become "ludicrously small"? Apple has given us the answer.

Source:
http://www.cnet.com.au