In this talk I will present a general overview of recent experimental
and theoretical developments concerning the superfluid behavior of
ultracold atomic gases. The transport properties and the propagation
of sound, the nature of quantized vortices and the absence of
viscosity will be explicitly discussed. Intriguing questions concern
the connection between superfluidity and the phenomenon of
Bose-Einstein Condensation and the role of dimensionality. The new
perspectives opened by the availability of artificial magnetic fields
will be also discussed.
