13" screen seems rather large for an ultra portable computer - I would have expected 11-12".
I'm also curious to see how no optical drive works out.
Apple has always been a leader in popularizing (not necessarily inventing) various technologies... be it firewire, ethernet, 3.5" microfloppies, CD-ROM, CD/DVD burners.
What I see is a move of foresight... The internet has had a tremendous impact on how we move and share data. So much so that it has rendered many types of removable media redundant. Between e-mail, FTP, blogs, myspace, youtube, etc. there are so many different options for content sharing and transfer with the ultimate portability factor... one can see that while removable media hasn't completely outlived its usefulness, it's getting there.
Apple is smart to be thinking about the future (or lack thereof) of removable media now. I was thinking about this the other day when I found a relatively simple way to access my media over the LAN from my iPhone without actually storing the content on the iPhone itself. As bandwidth increases, what's the point of local storage except for working with files that you tend to alter in a processor and memory intensive way? And how many of those does the average person actually intend to work on between trips to Starbucks?
I got laughed at by naysayers for suggesting that removable media is going exxtinct from consumer electronics, but here we are with at least half of the posts concerning the ultraportable's possible lack of an optical drive being, to even my own surprise, a positive reaction.
And this is in no small part thanks to the content ecosystems popularized by iTunes, YouTube and the like. And I feel that AppleTV, or some kind of successor to it, has yet some very important part to play in this ecosystem... bridging it all together for the holy grail of technological convergence.