The poll we're running does seem to favour both X and OE based systems equally. My only gripe would be that Yopy users by going down the OE route will loose X which so many Z users are after
OE (actually it's now been renamed BitBake, OpenEmbedded is the name of the config files used to build for ARM embedded devices) is simply a build system, nothing more. It doesn't choose what kind of Windowing system you use (for want of a better word). Opie and GPE (which is simply X11 using matchbox as the WM) are both available as options, or you can choose a console only build.
These various options are implemented by creating a meta file which says "add this package to the ROM image", etc. Therefore it is very simple to change matchbox for a different WM, etc. and to add in whatever else a yopy should come with.
Therefore, assuming you add in the various bits of software which aren't in there already and which you need to use, you could create whatever type of system you wanted (automatically - which is the nice thing). From the screeshots I've seen, the yopy has a WM a bit like matchbox, assuming the code's about this could be added in and used.
I saw a poll on yopyng which was asking people to vote between Qtopia, Opie, GPE or Standard X11. ROM images for all of these options could be built using OE.
Si