  Although there is mounting observational evidence that the cosmic expansion
is undergoing a late-time acceleration, the physical mechanism behind such a
phenomenon is yet unknown. In this paper, we investigate a holographic dark
energy (HDE) model with interaction between the components of the dark sector
in the light of current cosmological observations. We use both the new
\emph{gold} sample of 182 type Ia supernovae (SNe Ia) and the 192 SNe Ia
ESSENCE data, the baryon acoustic oscillation measurement from the Sloan
Digital Sky Survey and the shift parameter from the three-year Wilkinson
Microwave Anisotropy Probe data. In agreement with previous results, we show
that these observations suggest a very weak coupling or even a noninteracting
HDE. The phantom crossing behavior in the context of these scenarios is also
briefly discussed.
