Georgetown is the original SMP. Since then, many post-baccalaureate enrichment programs have been established. I do not believe that all of these are true SMPs. If I had to define special masters program it would go something like this:
A rigorous one-year pre-professional masters program that contains medical courseS. Some of these programs can take longer than a year, but the coursework is typically completed in one year.
These are the ones that fit my definition: Georgetown MS in Physiology and Biophysics (SMP), Rosalind Franklin MS in Applied Physiology, Boston University MA in Medical Sciences, UMDNJ MS in Biomedical Sciences, and Eastern Virginia MS in Biomedical Sciences (Medical Masters). I may have missed a few, but these are the major ones. I would also include Indiana's MS in Cellular and Integrative Physiology, but it has been suspended and may be discontinued altogether.
There are also two one-year certificate programs that are worth noting because their curricula are very similar to the SMPs: the Drexel IMS and Loma Linda Biomedical Sciences certificates
There are many other one-year programs such as: Colorado State MS in Biomedical Sciences, Barry MS in Biomedical Sciences (accelerated track), Florida Atlantic MS in Biomedical Sciences, Loyola MA in Medical Sciences, Indiana pre-professional non-thesis MS in Biology, Tulane MS in Pharmacology, Tulane MS in (Human?) Genetics, Tulane MS in Cell and Molecular Biology, Tulane ACP certificate (1 semester-1 year), KCUMB MS in Biomedical Sciences, PCOM Biomedical Sciences Certificate, LECOM postbac certificate, U Penn Special Science, TCOM postbac certificate, VCU pre-medical certificate, etc. Some of these are pretty solid programs, but I do not personally consider these as special masters programs.
There are many other pre-profesional masters programs that are 1.5-2 years. Some of these are: UAMS MS in Physiology (and Biophysics?) non-thesis track, Hawaii MS in Biomedical Sciences-Physiology Concentration Plan B, Louisville MS in Physiology and Biophysics non-thesis, KCOM MS in Biomedical Sciences, Wayne State MS in Basic Medical Sciences, Creighton MS in Biomedical Sciences, Creighton MS in Clinical Anatomy, UNMC MS in Cellular and Integrative Physiology, NYMC MS in Basic Medical Sciences, SUNY Buffalo Roswell MS in Natural Sciences (?), Rhode Island pre-professional non-thesis MS in Biology, Marshall MS in Biomedical Sciences-Medical Sciences track, etc. Some of these could be worth a look too, but I don't consider these as special masters programs either.
Here is a listing of postbac programs:
http://services.aamc.org/postbac/
It includes many enrichment programs, but there are many that it does not mention. You can even do a search on it for Special Masters Programs, but some of the programs that have been designated as such do not fit the mold, in my opinion.