The Zune is backed by Microsoft, and was built on orders of magnitude more than the Neos; the Wiz doesn't include GPS, accelerometers, 640x480 res touchscreen, or GSM chipset.
From my understanding, Openmoko was very limited in choices for SoC, because they needed to stick with open chipset, low power, ARM systems; the crucial point is open chipset systems, which most manufacturers won't give you for anything cutting edge. When your primary goal is freedom, and you insist on getting parts with open specs and chipsets, you eliminate a lot of your potential choices.
From my understanding, Openmoko was very limited in choices for SoC, because they needed to stick with open chipset, low power, ARM systems; the crucial point is open chipset systems, which most manufacturers won't give you for anything cutting edge. When your primary goal is freedom, and you insist on getting parts with open specs and chipsets, you eliminate a lot of your potential choices.