Investigators have yet to rule out arson as they continue to look for the cause of Colorado's Waldo Canyon fire, the most destructive wildfire in state history. Former FBI agent Brad Garrett and forensic psychologist N.G. Berrell talk about the process of investigating fires and the profile of an arsonist.

Yahoo said today that hackers had stolen and posted a file that contained 400,000 usernames and passwords.

The New York Times reports that those credentials were used not only for Yahoo! services but to services such as Gmail, AOL, Hotmail, Comcast, MSN, SBC Global, Verizon, Bellsouth and Live.com.

The Times' Bits blog reports:

With the July Fourth holiday behind us, now is the time to map out a musical adventure. Below is a sampling of just a few of the dozens of summer classical music festivals around the country, grouped by region. From outdoor extravaganzas and picturesque locales to intimate indoor settings, live music thrives in the summertime. Been to a good summer fest not listed here? Tell us all about it.

EAST

Prosecutors have released new evidence in the case against George Zimmerman, the Florida man charged with the murder of Trayvon Martin.

As The Orlando Sentinel reports, the new evidence doesn't reveal any "blockbusters." But it does include new testimony from police officers on the scene, as well as new testimony from witnesses

The Sentinel reports:

When Tom Jones performed at the NPR Music offices in 2009, it felt like an exercise in cruelty: His Tiny Desk Concert took a larger-than-life icon, a superstar for whom intimacy is implied but impossible on a huge stage, and shrunk him to where every bead of sweat could be seen. Young English folksinger Laura Marling, on the other hand, lives for that sort of intimacy.

A day after Republican presidential candidate Mitt Romney spoke to the nation's oldest civil right organization, Vice President Joe Biden appeared at the NAACP's annual convention. He quickly tackled one issue that drew Romney sustained boos — the 2010 health care overhaul.

Biden appeared in place of President Obama, who made a brief videotaped address thanking the group for its work. He walked out to warm applause, and several of his remarks were interrupted by shouts of agreement.

This week, a federal panel is hearing arguments for and against a voter ID law in Texas. U.S. Attorney General Eric Holder says the Texas voter ID law is like a modern poll tax. Guest host Maria Hinojosa talks more about the issue with Rep. Jose Aliseda, who testified at the hearing. He's a Republican State Representative for Texas who was born in Mexico.

Guest Host Maria Hinojosa talks with Kamala Harris, California's Attorney General about the state's newly passed "Homeowner Bill of Rights." The law, which was signed yesterday by Governor Jerry Brown, makes it harder for lenders to seize a property and allows homeowners to sue to stop a foreclosure process.