It came with Windows XP, and I'm still getting Debian (not the toy Linux that Acer vends) in place. Read on for discussion of what I've discovered so far.
Read it here
The information at http://wiki.debian.org/DebianAcerOne was very helpful. You won't have use of the ethernet OR wifi from the latest Debian install disk, but it will be able to install the base system from a USB stick using the “netboot” version of the installation system. The Debian pre-release
installer required a reboot to load new disk partitions, this seems to be a bug that should not be expected in the released version.