Although the advent of online learning has revolutionized the delivery of education, from the average student's perspective there have been few radical innovations in the general administration of pure online courses since their inception. With some exceptions the scheduling of online courses generally aligns with the university calendar, while professors adopt a delivery timetable parallel to the classroom. Although the technology continually improves, the experience of the students regarding the calendar remains the same. An alternative is to allow students to enroll in and complete a course at almost any point in time. These courses would operate continuously without a restricted start or end date. This paper poses the advantages and design considerations for perpetual enrollment online courses, as well as caveats. This proposal will be too radical for some institutions, but first-movers will have an advantage in attracting students from an untapped market. (Contains 2 tables.)