Miniemulsion polymerizations typically make use of ultrasonic irradiation to disperse the monomer into fine droplets (~100 nm) in the water phase. These droplets are usually stabilized against coalescence with a surfactant and against Ostwald ripening through the addition of a hydrophobe such as hexadecane. Recently described techniques for the synthesis of both cationically and anionically stabilized latexes have been used to study the effect of ultrasound on both the initiation and agitation of the monomer/polymer system. In this case, miniemulsion-like polymerization may be undertaken in the absence of added hydrophobe and initiator. The mechanisms by which this polymerization proceeds will be described, along with results of recent studies on the incorporation of other particles into the polymer latex particles.