I've had my first success getting OSX Lion to install with minimal headache using a patched OSX Lion 10.7.1 kernel and TonyMac's UniBoot USB kit.
I installed the Uniboot and OSX 10.7 (App Install) to an 8gb thumb drive, The UniBoot installer has an option to install laptop support, that has the Intel GMA and several other drivers that are used by the Acer Revo (and the Lenovo S10 also shares most of the same hardware)
I then downloaded and copied the patched 10.7.1 kernel to the boot stick so it'll make it through the install.
When the install completed, I rebooted into the boot stick, and instead of reinstalling, I went into the Terminal console and copied the mach_kernel file from the boot stick, to the Revo boot disk.
Next you'll have to reboot from the stick, but choose a verbose boot from cameleon for the INSTALLED OSX Lion disk on your Netbook/Nettop
It should now boot, The one thing I noticed is you DO NOT rollback the USB drivers, as they recognize the USB ports properly.
Next steps are to get HDA Audio drivers, (On the Revo, the Nvidia ION LE drivers) And Video so I can get native resolution on the Nettop, on the S10, it should recognize the native resolution.
The issues I've had with the S10 (first generation) that have prevented a complete install (kernel panic) is driver selection is trial and error, with the patched kernel, it gets almost to the installation, it seems to fail with a kernel panic on the SATA driver, but I'm almost past that, I just want to get the first ATOM steps documented and completed. And the Nettop didn't need too many "Non-Vanilla" drivers to start.
I want to try doing a combo update to 10.7.2 and then rollback the kernel to patched 10.7.1 to see if it works okay before I go any further.
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