While ASUS says that other OS is best, ACER merely recommends it. I am not sure what the difference is but ASUS sounds like a sell-out to me while ACER seems to be reflecting the comfort zone of people.
It is easy to find GNU/Linux on ACER’s site if you look for the 8.9inch netbook. News out of Taipei is that
“Acer is in the process of putting Moblin in the range of its products,” said R.C. Chang, chief technology officer at Acer, at a news conference in Taipei. Acer products that will soon run with Moblin Linux include Aspire One nettops, as well as regular laptop and desktop PCs, he said.
ACER may be just hedging bets but is seems a more friendly way to do that than what ASUS did. ACER is selling like hotcakes and is eating Dell’s lunch. ACER is seriously into supplying netbooks to ISPs.
see this article