Ind. KTVK Channel 3: June 10, 2009 @ 6:30 PM, and June 13, 2009 @ 5:30 PM.
CBS KPHO Channel 5: June 15, 2009 @ 7:00 PM, June 24, 2009 @ 7:00 PM.
NBC KPNX Channel 12: Didn't participate this year.

ABC KNXV Channel 15: June 7, 2009 @ 8:30 PM, June 11, 2009 @ 9:00 PM, June 13, 2009 @ 4:00 PM, June 14 @ 12:35 AM, and June 20 @ 5:30 AM.
The date announced for channel 3 is earlier than last year. The first special didn't air until June 15. Others lasted into late June or early July.
The reasoning is because this season is looking to start early, and stronger than normal. I'll create another topic for that later on.
Some stations stream these specials online. If you're interested in seeing them online, let me know, and I'll post links to them once the specials have aired.
Note: Ind. stands for independent.