"Data capture" is now done with a Lenovo ThinkPad X301. Faithful readers will know that I suffered the temptation of converting to Apple. The Airbook was the only machine light enough for my purposes. But it turns out that the X301 has the 128 GB SSD that I believe Airbook still lacks. Plus it has lots of ports and functionality Apple couldn't manage to stuff into the Airbook. For those looking for a light machine, I cannot recommend this machine highly enough.
I stayed with Windows XP but I did upgrade to the Microsoft Office Suite 2007. I am not a fan of Microsoft software, hence my thoughts of defection, but I have to say that Word 2007 is fantastically better than its predecessor. I am working on a manuscript and the "Document map" so buggy and unreliable in the old Word, now works superbly well and allows me to teleport easily from one part of the other. Sad to say, Microsoft's blogging option remains frustrating, but for these purposes there's always TypePad.