Giacomo's talk a few weeks back at the Mobile Ticketing Workshop in Århus, Denmark went down extremely well, rounding out an interesting discussion on the ins and outs of mTicketing. You can see his slides here:
Mobile Ticketing Workshop 2009
View more presentations from Masabi.
The ability to take payments from the customer and initiate the ticket sale from the mobile was cited as a key feature by a lot of attendees.