Pretty sure some Linux distros also offer forms of sub pixel rendering akin to ClearType.

What do you find dubious about pixel boundary alignment?

As a side note, please note Macs don't even offer a means of turning off aliasing anymore, which for folks like myself has serious implications for eye focus under some conditions. For all its faults, ClearType and similar rendering solutions at least allow me to tweak it to both my comfort level and even monitor pixel arrangement.