Do you have the iDisk Sync turned on under System Prefs>MobileMe>iDisk? If so that would probably be it. If not, I don't know.
Or if the calendar beta, when open, lets you store, it will allow a better service if internet drops?
that is what it exactly is, it makes it like a native app but in the browser, gmail is looking/going to do the same in its web interface so if you didnt have an itnternet connection you can still access, read, create and que to send email. this will be exactly the same but with mobileme calendar so you can see your entries without having to be on the internet
Calendar Beta? Am I the only one just hearing about this?