Scanning over ethernet, natively in OS X?
Harv,  This is not the answer you want to hear.  I went with the Brother printer/scanner models because it was clear that the HP drivers that they supply to Apple often do not support network scanning (there may be a few exceptions).  The Brother drivers do.

The other recommendation I have seen is to use the drivers that come with the OS, not the installable ones.  In some cases, it seems that the scan works when the installables are not present.

Also, if the printer has SMB sharing, that sometimes needs to be turned on (usually only available on the higher end models with hard drives).

~Hilton