We give an overview on several recent topics of colossal magnetoresistive
manganites in both experiments and theories, focusing on the effect of quenched
disorder. The disorder is intrinsically involved since the compounds are solid
solutions, and its importance has been pointed out in several experiments of
transport and magnetic properties. Recent progress in the experimental control
of the strength of disorder is also reviewed. Theoretically, the effect of the
disorder has been explored within the framework of the double-exchange
mechanism. Several efforts to understand the phase diagram and the electronic
properties are reviewed. We also briefly discuss a recent topic on the effect
of disorder on competing phases and the origin of colossal magnetoresistance.Comment: 5 pages, 4 figures, proceedings submitted to SPQS200