iCalendar and CalDAV: Call to arms

Lisa Dusseault has a call to arms if you think you can help with developments in the area of calendaring standards. An effort well worth supporting, if you ask me. I find it hard to understand that there is no widely accepted standard for this available yet (I understand that there are technological ways to work this – but it doesn’t appear that there is one that’s being used by a lot of commercial / non-commercial apps yet).