the rotational speeds of galaxies [@rotationcurves], the orbital velocities of galaxies within clusters [@clusters], gravitational lensing [@lensing], the cosmic microwave background [@wmap], the light element abundances [@bbn] and large scale structure [@lss]. Despite these many observational indications of dark matter, it is clear that it does not consist of baryonic material or other known forms of matter. For the time being, we remain ignorant of the particle identity of this substance.

In this review, we summarize some of the most promising strategies and techniques being pursued to elucidate the nature of dark matter. These efforts include direct detection experiments designed to observe the elastic scattering of dark matter particles with nuclei, indirect detection experiments which hope to detect the annihilation products of dark matter such gamma rays, neutrinos, positrons, antiprotons, antideuterons, synchrotron radiation and X-rays, and collider searches for dark matter and associated particles.

The material presented here is not intended to be an exhaustive summary of the field of dark matter physics. Such reviews can be found elsewhere [@Bertone:2004pz]. In this article, we limit our discussion to the case of candidate dark matter particles with electroweak scale masses and couplings. Furthermore, for the sake of length, we do not 