I briefly had the 2.4 17" MBP 1920x1200 for four days that I had the air before the new owner picked up the MBP, and i never turned the MBP on. The Air is a vastly brilliant machine, and to think i was so sceptical at launch. It's the perfect size/weight/speed/heat I'm really happy.
And speaking as someone who detests glossy screens, i love the air's screens. As a poster above said, you can really see it well outside. Partly the brightness, but also because glossy screens reflect light i believe, and matt ones absorb it, and wash out the picture. My 17" mbp was useless in bright sunlight.
The auto backlight adjust works much better than the mbp too, due to where they've positioned the sensor now.
I take delight in going into an electronics retailer here and looking at the laptops at how chunky they are, with creaky weak plastic casing and bits that break off, slide out cd trays, catches on the lid, tiny track pads with horrible plasticy buttons and a skinny scroll area down one side.
And I doin't know why, but the MBA is snappy, it is quick. That 80gb drive is really fast enough. I've done some multitrack recording on it and it handles it (just had 6 tracks playing back whilst recording 8 from a Line 6 UX8 8 way usb2 audio interface into logic. works well.
I have no regrets, i completely don't miss the macbook pro, and if i still had it i'd never use it.
This is an awesome notebook, it's so portable i usually have it with me. it's lessened the amount i use the iphone for web surfing.
