  Using a simple model for interacting electrons in two dimensions with random
disorder, we show that a crossover from a Wigner liquid to a Wigner glass
occurs as a function of charge density. The noise power increases strongly at
the transition and the characteristics of the 1/f^alpha noise change. When the
temperature is increased, the noise power decreases. We compare these results
with recent noise measurements in systems with two-dimensional metal-insulator
transitions.
