This plugin's function is very similar to the 'Reminders' part of the 'Notes and Reminders' plugin.
It allows you to set alarms of several types: once-off, daily, weekly, and weekdays. By default, when the alarm is triggered, it pops up a window with the title and description provided when the alarm was created, and plays a sound (configured like other sounds via options->events->sounds). You can opt to not show the window or play the sound, and you can have the alarm run a command.
The popup-window includes a snooze button - the snooze time is configurable via the options page (options->events->alarms).
You can choose to use the popup module instead of the built-in alarm window - in that case, left-click on the popup is snooze and right-click is dismiss.
Thanks to Faith Healer for suggestions re window layout.
Please test and post any bugs/comments here.