My opinion is that the current air is great for light weight development and travel, but not so good for heavy development. My use case is probably different then most, as I run 2 linux VMs, 1 win7 VM Xcode, Eclipse IDE, Xcode IDE, Komodo IDE, Adobe CS Suite and compile java, c, c++ in millions of lines of code. I'm currently working on a 17" mbp on 8gb ram and 480GB ssd. I'm usually 12 gb into swap, so I would love 16gb. I heard that the 15" air is in the pipeline, so that might be a good option.
1. PC... pop out the BIOS battery to clear the BIOS password, re-flash the BIOS, DoD wipe the harddrive and install Windows fresh.
2. Mac... pop out the battery, wipe the PRAM, DoD wipe the harddrive and install OSX fresh.