Jupiter Research has released the results of a recent survey that suggests that space for "1000 songs" is sufficient for average consumers. 1000 songs with Apple's iTunes AAC or with 128-bit MP3 encoding would be roughly 4GB. Not suprisingly, this is the size of the extremely popular Apple iPod Mini and Creative Nomad MuVoČ.
BBC News and CNet also have articles on the survey.
From the BBC News article:
"[T]he report said that almost half of those thinking about buying a portable player, 45%, would like one that could play video."
From the Cnet article:
"Hard drive size isn't the only thing that matters to music lovers. When asked which features matter most, 55 percent listed a rechargeable battery, 52 percent said small device size, and 49 percent said the ability to connect the device to their computer. Vendors should be cognizant of these priorities, Jupiter said"
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