A Riovolution member (lucky enough to be a Carbon beta tester, we think) has taken some comparison photos between the 5GB Carbon and the 1.5GB Nitrus. From what we can see, they look pretty close in size. If so, Rio could have a big winner on its hands. The Carbon has a cool look without being an iPod clone and the runaway success of the iPod Mini demonstrates that 5GB of space is enough for a lot of people.
Related Links:
Rio Carbon Officially Official
New Chroma from Rio?