UPDATED: Dates to iCal and MobileMe beta
UPDATED: A couple of weeks after writing this a user of Dates to iCal wrote to tell me that Dates to iCal is now working with the MobileMe beta.
Apple have recently opened up their MobileMe beta and I have had reports that Dates to iCal is not working with the new beta version of MobileMe that uses CalDAV.
I'm working on this and hope to have a solution as soon as possible. See below how to use Dates to iCal with the MobileMe beta.
The MobileMe beta converts the user's local iCal calendars to CalDAV calendars stored on Apple's servers. The Calendar framework developed by Apple that Dates to iCal uses to add items to iCal does not fully support CalDAV calendars (I have raised this as a bug with Apple and hope to have a response soon).
This combination means that Dates to iCal cannot write to the newly created MobileMe calendars.
The MobileMe calendar beta has recently been updated so that Dates to iCal can currently work with it. To get it working; Create the calendars you want Dates to iCal to use in the MobileMe group in iCal. Then open Dates to iCal and use the calendar names of the calendars you created in iCal. Once quitted, Dates to iCal will start using these calendars and should work as expected.
I'm grateful to the Dates to iCal users, Dave for letting me know this was working again, also Martin, Troy and Thomas for confirming the workaround.
Obviously, MobileMe beta (being a beta) is subject to unannounced changes. I hope this is a feature they keep.