MorphOS 2.7 as my primary OS (with copies of OSX and Ubuntu on the same system). Can't wait to see version 3.0 (Powerbook, and improved SATA and SCSI support).
Windows XP and Vista (which is really underated) on two other home computers.
Hoping to encourage others using legacy hardware to consider PPC OS'.
I may, at some point, reconsider AROS.