OK cool, I was wondering if it was the 11" since you were talking about portability (and its size proximity to an iPad).
I'm thinking of migrating the Wifey© from a 13" MBP to a MBA, and was thinking of _maybe_ sizing down to the 11, especially with its increased resolution, you're getting roughly the same screen real estate, though scaled down and a wider aspect ratio. Not sure if losing a little vertical height will cramp reading/writing that much more[?]
The only experience I have a small notebook screen was her Netbook, which was a craptacular little turd, not sure how she even used it for as long as she did, but she tends to dive into things and not bitch about much.

It's now running (or "running") XBMC in my office, permanently connected to my Toshiba RP TV
Good question on the "snap" feature which I totally dig on Win7. When my HP notebook goes TU (based on the constant 747 fan noises, it won't be long), I'm going to switch to a MBP (probably a 15" HR) and I've kind of been mentally compiling "must have/really want" features I'd like to replicate in OSX. Interestingly enough, all my non-iOS development is in .NET, and using some Windows only tools like EMS/Oracle ... already tested under Parallels/XP on the 13", works terrific!
OK, enough topic derailment..
[edit]
OK, maybe a little more
Awesome, thanks x2!