Update: Things going nicely with the new Air. It took a long time but it finally charged fully and has held it well. Guess it was tired from its long trip from the Long Island warehouse to NJ.
I did have some trouble with the Wifi at my house. I spent hours trying to get it to stay connected but it would drop every few seconds. I read through a lot of the threads at the Apple forum (one is 128 pages long) about the problems some people have with the Airs and Wifi. Tried all the suggestions but nothing worked. I was afraid I was going to have to return it but I waited til I got to my Dad's house where we have the latest Airport Extreme (6th gen). Was quite relieved to have it pop right on and stay solid with excellent download speed. It found the three printers on the Extreme network and set them up in minutes. So easy, no software to install, just type in the password for the network and TA-DA. Have to put the blame on my old router at my house, just too old to keep up with the new stuff. I remember I had trouble with the iPad at first with my router but it worked fine at Dad's. Lesson learned.
Presently moving a few apps to the Air but will not fill it up with a lot of trash since it will be used for things that won't require access to a lot of data. Am very impressed with the speed. Login to the desktop is almost instantaneous. I was worried about it being too small for my eyes but I just set minimum font sizes in browsers and for labels and things are not to difficult to see (with my reading glasses of course).
Only negative at this point is I will have to pay for the updates to some programs I use. Been running Snow Leopard mostly and some apps won't run on ML without a paid update. Boo.
Oh, also have to do some thinking when connecting to older externals. Got a thunderbolt to FW adapter and a couple 800 to 400 plugs so all my older drives will be usable. Also got one of the Apple external Superdrives so I wouldn't have to go through the sharing dance.
All in all, pretty pleased with the Air. It's so light, yet solid. Think I will be using it more than I first anticipated.