I may have misintepreted, but I thought that was what vacuum energy was. What is zero-point energy if it isn't energy (or matter) from nothing?
It is the base or ground state of the vacuum, zero point energy in basic terms still has a positive value (rather than nothing).
The problem with this is that anything contained within our universe is not a true representation of an 'absence of anything' (for want of a better term) and we are somewhat reliant on definitions of 'nothing' rather than any absolute definition such as the absence that exists (or doesn't, again with the limitations of human language) outside the universe.
but in essence Vacuum Energy is by definition 'something'. It is widely accepted that the cosmological constant has a non-zero value (based on observations by the Supernova Cosmology Project) and those theories in super-symmetry that require an exact zero value only add to the cosmological constant problem, which AFAIK is still unsolved, but people have some pretty interesting ideas on it.
http://www.gemarsh.com/wp-content/uploads/Vac&CosmConst-Rev1.pdf
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