Hi Gerrit du Preez,
Thank you for writing. We are currently working on the resource grouping functionality for RadScheduler, and unfortunately we will not have time to implement reminders for Q3 2009 release. You could relatively easily implement reminders yourself using a timer to check on a given interval (for example every minute or even less) if there is an event starting soon. And to make this work more efficiently you could check just the appointments for the next hour.
You can easily find the appointments for a day by creating a day view for this day and calling the UpdateAppointments method with the appointments collection of your scheduler instance.
If you want to find the appointments for a smaller period than a day you can do that by checking the appointments in the scheduler appointments collection, and if an appointment has a recurrence rule, you can use the GetOccurrences method of the Event class.
I hope this helps. Do not hesitate to write again if you have more questions.
the Telerik team