I wrote a little calendar module, that adds a calendar to the toolbar, and lets you tag your posts so their titles show on a community calendar for your site...

it also has a freetextbox wrapper with an integrated popup date picker, this feature was a last minute adder, and only really works for USA dates, and is probably not appropriate for large sites....
I will work on providing a better wrapper for the calendar picker button, and will probably make adding a post to the calendar require moderate permissions... The source for this control will also be made public when I can get it cleaned up.
Dan
Got Questions or Comments? The discussion is over here http://communityserver.org/forums/permalink/516549/516549/ShowThread.aspx#516549
Update 02.03.2006 : Note there was an error in the originally included communityserver.merge.config which had the wrong namespace for the CSModule... the correct module registration would be
<add name = "CalendarLinkModule" type = "DanBartels.CS.Calendar.Components.CalendarLink, DanBartels.CS.Calendar" />
Update 02.21.2006 : I rebuilt the calendar module to update the Component Art control reference to match that of the CS 2.0 RTM; I also included ASPNET 2.0 versions of the binaries (in the bin\framework2 folder) these should only be used with CS installs that were compiled under VS2005.
Update 04.24.2006 : I fixed a permissions glitch which would cause an error if the calendar tried to display a post the user didnt have access to. I added a new CSModule, AdminCalendarLink, which only adds administrative posts to the calendar. I also made a new job and module, which adds users birthdays from their profile to the calendar.
Update 05.01.2006 : I forgot to put the latest Calendar.dll in the bin\framework2 folder... I updated the zip, you need to make sure the dll is 2.0.60424 or higher to work with asp.net 2
Update 05.24.2006 : Fixed support for adding file gallery items onto the calendar. Updated Admin calendar link to use current user not post author for the permissions check. Update the calendar/default.aspx to use applicaiton paths not relative ones for the stylesheet
Update 5.25.2006 : (no binary changes) Updated out of date CommunityServer.merge.config
Added a ComponentArt script update from Ben Tiedt to fix callbacks failing through a proxy
Update 5.27.2007 : Updated control to be CS 2007 compatable, added new install documentation; the zip contains both the original CS2 version and the new CS2007 version.