For consistency with previous released versions of iCal: I think the default should be last selected calendar.

iCal 5.0 (1535) in Mac OS X 10.7 (Build 11A511) seems to avoid that default, iCal seems to make a guess — often a wrong guess — and so begins the confusion.

The option that people seek is too easily overlooked, because it's at the foot of a sometimes long menu. For a considerable number of users, probably hidden when the menu first appears.

If concerned, please state whether you agree with these three points:

1. the menu item last selected calendar should be first, at the head, at the top of the menu
2. for a new user of Lion, the default calendar should be last selected calendar
3. for an existing user upgraded from Snow Leopard to Lion, the default calendar should be last selected calendar.

Thank you