8. A computer program product residing on a non-transitory computer readable storage medium having a plurality of instructions stored thereon, which, when executed by a processor, cause the processor to perform operations comprising: generating a specific calendar event that is addressed to a plurality of calendar event recipients, said calendar event being an event scheduled to occur at a future time for a plurality of participants and recorded in an electronic calendar in a calendaring application, said calendar event recipients receiving an electronic notification of said calendar event via a computer network; generating a designation of a subset of the plurality of calendar event recipients as first annotation recipients, such that, with respect to the specific calendar event, there are both general event recipients and first annotation recipients; and associating a first annotation with the calendar event, the first annotation comprising information additional to the calendar event as originally created and being addressed to the first annotation recipients, such that, with respect to the specific calendar event, all recipients are sent the electronic notification, but the first annotation is sent only to the designated subset of recipients for that calendar event.
8. A computer program product residing on a non-transitory computer readable storage medium having a plurality of instructions stored thereon, which, when executed by a processor, cause the processor to perform operations comprising: generating a specific calendar event that is addressed to a plurality of calendar event recipients, said calendar event being an event scheduled to occur at a future time for a plurality of participants and recorded in an electronic calendar in a calendaring application, said calendar event recipients receiving an electronic notification of said calendar event via a computer network; generating a designation of a subset of the plurality of calendar event recipients as first annotation recipients, such that, with respect to the specific calendar event, there are both general event recipients and first annotation recipients; and associating a first annotation with the calendar event, the first annotation comprising information additional to the calendar event as originally created and being addressed to the first annotation recipients, such that, with respect to the specific calendar event, all recipients are sent the electronic notification, but the first annotation is sent only to the designated subset of recipients for that calendar event. 11. The computer program product of claim 8 , wherein the instructions for associating the first annotation with the calendar event comprise instructions for associating the first annotation with the calendar event after the calendar event is sent to the plurality of calendar event recipients.