On the Mac front, one of my clients just got a new MBA 11" and has already returned it.
He loved it, but it's not ready for his duty I guess.
Problems : Office 2011 Mac has significant issues staying connected to Microsoft Hosted Exchange services, and they don't have a workable BPOS or whatever for it that's stable yet (Microsoft fault here). Battery life shockingly poor (~3.5 hours with his use, which is just email, egnyte, office).
Pluses : Beautiful. Quiet. Fast. Thunderbolt.
I think he'll re-buy once some of the issues are ironed out, perhaps in the 13" model if it offers better battery life, as I believe those have larger internal batteries.