xPDO 2.0 was just recently developed in conjunction with MODx 2.0.0-beta5 and no download for the xPDO 2.0.x branch existed until last night. xPDO-2.0.0-rc1 is available now @ http://www.xpdo.org/downloads.html#rc
How come there is only a download link for xPDO 1.0 but not xPD0 2.0. There is documentation for 2.0 but no download. Is 2.0 just native to Revolution?