This short review highlights some open questions regarding the dynamics of accretion disks in Algol and related systems. Standard disk theory hes been quite sucessful in cataclysmics, prostellar thick disks, and active galactic nuclei, but our understanding of relatively normal accretion flows remains less satisfactory. Some problems that remain unanswered include the treatment of the Roche surface as a limiting radius, the structure of Algol disks and viscous accretion, and boundary layer.