On the calendar view I can open Shared Calendars or I can Share My Calendar.
I have often desired one more option: Request to share a calendar. This
request would then automatically add their calendar to my shared calendars
list when that individual clicks approved for my request.
That's one of the features planned for Outlook 2007.

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Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003
http://www.turtleflock.com/olconfig/index.htm
and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
> On the calendar view I can open Shared Calendars or I can Share My Calendar.
> I have often desired one more option: Request to share a calendar. This
> request would then automatically add their calendar to my shared calendars
> list when that individual clicks approved for my request.