StartupReminder is a very simple application that allows you to schedule memos for certain dates (not times - as many real schedulers do); and it allows you to specify a frequency for these memos, because many things will be recurring on regular basis (e.g. every 14 days, every 2 months, or every year (birthdays!)). If necessary, you can even get reminded a number of days in advance as well, so you have time to prepare for the event.
StartupReminder will display memos (on the given days) when your computer boots. The advantage of this method is that the program takes up no system resources whatsoever.
The program has a very intuitive interface and is optimized for quick use. You don't ever have to wonder what date friday in two weeks could be to schedule a memo... The program always displays the weekdays and allows you to pick dates in the near future from a list.