  We argue that string theory has all the ingredients to provide us with
candidates for the cold dark matter and explain the current acceleration of our
Universe. In any generic string compactification the dilaton plays an important
role as it couples to the Standard Model and other heavy non-relativistic
degrees of freedom such as the string winding modes and wrapped branes, we
collectively call them stringy cold dark matter. These couplings are
non-universal which results in an interesting dynamics for a rolling dilaton.
Initially, its potential can track radiation and matter while beginning to
dominate the dynamics recently, triggering a phase of acceleration. This
scenario can be realized as long as the dilaton also couples strongly to some
heavy modes. We furnish examples of such modes. We provide analytical and
numerical results and compare them with the current supernovae result. This
favors certain stringy candidates.
