I already have a design and application developed half the way. One feature is remaining in it to look up the events of different calendars synced by user in my application in portrait mode.
Selected users need to be displayed horizontally on x axis at top and their timeslots on y axis for all the users and highlight the timeslots which are busy for all the users n also highlight free timeslot.
Clicking on free slot n add meeting button time, recipients and user email to create event should get auto filled and event must get created.
Its really interesting iphone app to work on. Looking for your bids.