actually carrying one of each in my bag - I'm changing back to the MBP (now that they are lighter and faster).

I love the air though. If you sit at home with the computer on your lap while you watch tv then you should really consider the air - it's so light. I thought the screen would be too small but I never felt that way. I used xls extensively and had 20 windows open at once and felt the screen size was just fine.

I'm switching back to the MBP because the new MBP is faster and I'm impatient (that's why I buy a new computer every 18 months or so). But at times I wish I had my lighter MBA on my lap.