I was really surprised by the weight of this machine. It's also very low-resolution. But the build quality is much-improved over precedessors. If Apple started to compete based on weight and resolution I might consider them, but who knows--maybe they're trying to avoid impinging on the lower-level ipad market.

2kg? Positively or negatively? My sister bought this dell (http://www1.la.dell.com/content/products/productdetails.aspx...) and its 1.6kg. Everyone loves the weight.

The 13-inch Macbook Pro is just a lot heavier than it looks. It's much smaller than the 15-inch, but not much lighter.

That's more than enough. I have a MacBook 13" in the office, and when I bring it home I plug it into a 26" Samsung display with mac keyboard and magic mouse, plus various external HDs.

This. + Magic Mouse and Lacie firewire speakers. May get the cinema display sometime soon.

Yes - Cinema display or other nice external monitor. Should boost productivity (although I'm not sure how much).