Hey there, been using a MBA second revision. I've noticed however that it will exhibit peculiar behavior; namely that the fans will tend to ramp up despite the machine not being very hot; iStat shows that the CPU is hovering in the 60-65*C range, and normally the fans will stay around 2500 RPM. However if something ramps up the CPU, the fans will ramp up (as they should), but won't come down after the machine cools short of a restart. SMC works for a while, but then the issue returns. EDIT: After an appointment at the genius bar they said it was fine; they tested it but ultimately said their machines at the GB are much the same because the MBA has a more aggressive curve for the fans compared to other Macs due to how thin it is. So, no worries. FWIW I also did a clean reinstall of Snow Leopard (had only done the upgrade path prior and not a true clean install) and I think that took care of it completely. Thanks for all the help.