Honestly, I love my OS X Wind also. Obviously, it is no MBA, but it has such a small footprint even if it is thicker than the MBA. I find that it handles internet, word processing, and standard def video well. I've typed and revised my resume, browsed countless websites (including this one), and watched a couple season of Battlestar Galactica and some movies on it. It is about the size of a portable DVD player, so I REALLY like that. I get at least 4 hours of battery when doing a balanced combination of these tasks.
I would recommend a bluetooth mouse for the Wind. The trackpad is workable, but it can be frustrating. And I like Windows 7 on my Wind about as well or better than OS X for what I use it for (really just learning OS X, though).
Now that I have an Air, I might not keep the Wind. I will just have to see how my usage works. I will not keep something if it sits collecting dust. I would rather sell it and put the money to use somewhere else.
Anyway, the Wind is awesome. I just got my MBA and have quickly found out that it is much better (and much more expensive, too). But the Wind makes a fantastic secondary machine for someone (snappy, great screen, very small). My MBA is going to be my primary (for now at least).
Hope that info helps.
Edit - Just to give you a little more advice based on my experience and from reading this site, you can't go wrong between the MBA revA or the Wind for a portable secondary machine. Deciding between the two depends on what your needs are. If I had the extra dough, I would get the Air instead of the Wind even if all I planned to do was browse the internet and type documents.
