The conversion to the new alternative refrigerants caused by the greenhouse and ozone effects is now replacing nuclear reactor analysis and safety as the major driving force in two-phase heat transfer research. Extensive studies are underway on pool boiling, single-tube condensation, boiling and condensation on tube bundles, intube boiling and condensation, effects of mixtures, two-phase flow patterns in plain and microfin tubes, and development of new higher performance heat transfer augmentations. A survey of developments is presented here.