I've copy/pasted below a new post to the devicekit-devel mail list. I can't vouch for the accuracy of any of it, but it did catch my attention:
======================================================================= There seems to be a lack of information in a central place about what to use in place of HAL. Obviously UPower, udisks and udev are part of this, but they only cover part of the functionality of HAL, which provided other information and services in a consistent way. I've been improving the pages on the FDO wiki to correct this situation, and I've commandeered http://www.freedesktop.org/wiki/Software/DeviceKit to bring together information on how to do various things that used to be done with HAL. I've done what I can, so this is a plea for those in the know to check what I've written and add anything I've missed. Thanks Alex
