Progress is reviewed in studies of vibrationally compacted and other particle-containing ceramic fuel elements. lncluded are details of the equipment and techniques for the vibrational compaction process developed at Hanford. This process has been applied to fuel elements of various geometries. comprising several types of core and cladding materials. With proper control of process variables. uniform densities greater than 90% of theoretical density are routinely achieved. Information is also provided regarding nondestructive testing and in-reactor irradiation studies. Fuel elements evaluated thus far demonstrated high integrity, excellent stability, and adequate fission gas retention under extreme operating conditions. One of the most interesting applications for vibrationally compacted fuels is in plutonium fuel cycles. in which plutonium may supplement as well as supplant enriched uranium. The application of vibrational compaction to partially decontaminated recycled fuel is also described. and areas for future work are outiined. (auth)