  Entropy bounds render quantum corrections to the cosmological constant
$\Lambda$ finite. Under certain assumptions, the natural value of $\Lambda$ is
of order the observed dark energy density $\sim 10^{-10} {\rm eV}^4$, thereby
resolving the cosmological constant problem. We note that the dark energy
equation of state in these scenarios is $w \equiv p / \rho = 0$ over
cosmological distances, and is strongly disfavored by observational data.
Alternatively, $\Lambda$ in these scenarios might account for the diffuse dark
matter component of the cosmological energy density.
