Couple weeks ago I posted a story about MLB and the Washington Nationals using barcodes for mobile ticketing.
New A's Ballpark has a detailed summary of his experience using the mobile ticketing service from Tickets@Phone.
The A’s are one of three major league teams to employ the new service this season. This is smart because they lead the league in last minute ticket sales.
If you know who the third team using this mobile ticketing service, let me know.