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picked up the base 13" today, very cool, fast & light. Wish it had a backlit keyboard, but oh well I guess. Not that much bigger than 11" & resolution is great. Can't go wrong either way though.
Good poll but we have to be aware that the results are biased as we're techies. My impression is that in the general public the 11" will trounce sales of the 13".
I imagine in people's eyes this is finally Apple's premier netbook. Nothing else even touches it at this form factor as far as I'm aware (I may be wrong). The 13" has more worthy competitors.