This thread on the Air NZ forum confirms what many of us suspected that airlines are not ready for 100% eticketing by IATA’s self imposed deadline of 1 June 2008. There is a long list of circumstances where e-tickets are not supported. Most items on the list I’d expect to be in common for all airlines, but some will be airline specific (eg depending on which airlines are interlined).
The worrying aspect is the warning that (re)issuing of any paper tickets after 31 May 2008 may take 5 or more working days. Too bad if your plans change at the last minute and your itinerary is not eticketable.