LOS ANGELES -- Substitute teacher Liliette Pena watched TV images of the devastation wrought by Hurricane Katrina until she could watch no more. She turned to her checkbook.

"It's heart wrenching," Pena said, stifling sobs as she waited to donate $100 at a Red Cross center at Dodger Stadium. "I'd like to think that if anything like that happened to Los Angeles, people back East would do the same thing."

Thousands of Americans reached out to victims of Katrina on Wednesday as pictures of the storm-ravaged Gulf Coast overwhelmed living rooms and offices across the country. From churches to ballparks and radio stations to train stations, efforts to help were under way.

Many givers, like Pena, reached for their wallets. Others packed their bags and prepared to join the stream of civilian doctors, nurses, paramedics, morticians and veterinarians headed south.

Still more opened their restaurants, churches and even bowling allies for impromptu fund-raisers for stricken friends and relatives -- some still missing days after Katrina passed by.

The Red Cross had collected $21 million, nearly $15 million of that from individual donations through its Web site, Red Cross spokeswoman Kara Bunte said. Some insisted on making their donations in person.

"I just felt the situation down in New Orleans is something that can happen anywhere in the world and I wanted to be a part of the whole thing," said Los Angeles electrician Barry Durham. "I wanted to be more personal about it."

The help came from individuals, Fortune 500 companies, sports stars and entertainers.

The U.S. Chamber of Commerce said initial corporate donations to the relief effort could total more than $100 million, including $5 million from Chevron Corp., $3 million each from JPMorgan Chase & Co. and Citigroup, $2 million from Pfizer Inc. and $1 million from insurer State Farm.

The Walt Disney Co. contributed $2.5 million, $1 million of which will go to the American Red Cross and the rest for rebuilding efforts and volunteer centers helping affected communities.

Nissan North America sent 50 trucks. Anheuser-Busch offered more than 825,000 cans of water. Sprint Nextel Corp. donated 3,000 walkie talkie-type phones for emergency personnel.

Seven truckloads of crackers and cookies were on the way thanks to Kellogg Co. Two dozen cars and trucks were offered by General Motors Corp. Home Depot and Lowe's pledged cash and manpower, while Culligan International sent five truckloads of water.

More than 100 tractor trailers from as far away as California and Wisconsin were on their way to aid Katrina's victims in southwest Alabama with food, water, ice and blankets.

"It's a good feeling to help. They don't have food, no water, blankets or anything," said driver Tim Cupp, who is ready to deliver a truck full of Meals-Ready-to-Eat. "It's hard to put yourself in their shoes."

Governors across the nation pledged to send troops, doctors and engineers. They also opened their schools for any displaced students who couldn't afford to lose a semester on their way to a college degree.

Recalling the national support given South Carolina in the wake of Hurricane Hugo in 1989, Gov. Mark Sanford said, "we're ready to return the favor." The state's National Guard was pulling together a military police company, a water purification company and a transport unit to be sent to the coast.

Smaller efforts have also begun. At Ragin' Cajun, a popular Creole restaurant in Hermosa Beach, Calif., the Domingue family -- natives of Lafayette, La. -- collected more than $550 to help a friend's business that was wiped out by flood waters.

In Pensacola, Fla., Richard and Sarah Trimble left their own storm-damaged home to drive to Mississippi to help feed victims of Katrina. They were with more than 100 members of two faith-based organizations who set out in a 31-truck convoy that included mobile kitchens and showers.

"We get more out of it than the people we serve," said 68-year-old Chester Gunn, of Brandon, Fla. "To see the people standing in front of you with tears running down their eyes and saying 'Thank you' -- that's something that money can't buy."

Telethons reminiscent of benefits for tsunami and Sept. 11 victims were announced Wednesday featuring artists such as Wynton Marsalis, John Mellencamp, the Dave Matthews Band and Green Day. Jerry Lewis' annual Labor Day fundraiser for the Muscular Dystrophy Association will also appeal for donations to hurricane victims. The MDA said it would contribute $1 million.

The world of sports jumped in, as well, with the National Football League and New York Yankees each donating $1 million to the American Red Cross. Tennis player Serena Williams offered to donate $100 for every ace she hits the rest of the year.

In Detroit, the owners of Community Bowling Centers planned to donate 50 percent of their revenue from three counties during a Labor Day bowl-a-thon. And Florida State University asked fans to donate during a football game Monday against rival Miami.

In Green Bay, Wis., star NFL quarterback Brett Favre spoke emotionally about the devastation in his boyhood home of Kiln, Miss. He said the Packers flew relief supplies to Tennessee on the team plane for distribution in Hattiesburg, Miss., and further south.

"It's devastating," said Favre, who added that 50 friends and relatives were camped out at his Hattiesburg home. "The Gulf Coast is gone."

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On the Net:

FEMA Charity tips: http://www.fema.gov/rrr/help2.shtm