Shared Appreciation Mortgages coming back?

With all the discussion of the subprime issues and the decline of housing, new innovative ways of financing will emerge, when applicable. One such program is the SAM.

A shared appreciation mortgage or SAM is a mortgage in which the lender agrees as part of the loan to accept some or all payment in the form of a share of the increase in value (the appreciation) of the property.
Of course, in a flat or declining market, this may not be a good deal for a bank. Some banks seem to be offering this type of program.