Here is a paper of special interest to me. The authors model inertia and gravitation as effects of the EM fields. http://xxx.lanl.gov/PS_cache/gr-qc/pdf/0504/0504061.pdf Unfortunately, they still model the ZPE fields as if they were pretty flat. This is not logical, because if the ZPE fields have dynamical effects on the massive bodies embedded in them, the fields are capable of polarization and densification. Without a mechanism to explain the dynamical effects of the masses on the fields, as well as the effects of the fields on the masses, they are missing something critical. Particularly the optical effects of the polarized ZPE fields on EM propagating through them.