The devastating southern Asian tsunami has brought George Clooney and Bill O'Reilly back together.

For another war of words.

Three years after going at it over a post-9/11 fundraiser, Clooney, the Ocean's Twelve smoothie, and O'Reilly, the Fox News finger-pointer, are trading barbs again--this time over a post-tsunami fundraiser.

To Clooney, O'Reilly renewed the rivalry last Thursday when he announced on his cable TV show that he would be "watching" to see if the money donated in the upcoming Tsunami Aid: A Concert of Hope telethon makes it to its intended victims.

"If it does not," O'Reilly warned, "there will be trouble."

Clooney, who is recruiting names for the NBC broadcast, took exception to the remarks.

"Your report last Thursday was a preemptive strike...NOT to protect the families affected by the tsunami, but to create more controversy for your own personal gain. Because of it, fewer people will donate money to help truly traumatized victims, they'll be afraid that their money will do no good," Clooney wrote to O'Reilly in a letter released Monday through the actor's publicist.

A veteran pen pal who previously has papered the likes of Entertainment Tonight, the Screen Actors Guild and (natch) O'Reilly, Clooney closed out his latest missive with a twist: An invitation.

"I'm booking talent for the tsunami event...and you, Mr. O'Reilly, are now officially invited to be a presenter," Clooney wrote, exhorting, "you personally follow up on our fundraising."

O'Reilly addressed the offer on Monday night's edition of The O'Reilly Factor.

During a segment called, "Most Ridiculous Item."

"I don't think he likes me," O'Reilly said of Clooney.

But while dismissing the "insulting" parts of the letter (among other things, Clooney accused O'Reilly of making more money than him), the sometimes-bullying broadcaster didn't outright reject the actor's overture to appear on Tsunami Aid.

"That sounds good to me," O'Reilly said. "But..."

O'Reilly told viewers that before he agreed to participate he wanted to know the format of the program, and the specifics of how donations will distributed. Then he joked that "my pal" Clooney was considering him for a role in "Ocean's Thirteen."

O'Reilly and Clooney clashed in 2001 when O'Reilly called out celebrities who took part in events such as the America: A Tribute to Heroes telethon, saying they wanted the publicity, but not the responsibility of following up on the donations. Clooney fired back, saying (or, as is his way, writing) that any insinuation that the United Way-managed Tribute to Heroes funds were misused was "a lie."

While O'Reilly is down as a maybe for Tsunami Aid, Madonna has RSVP'd as a definite.

The Material Fundraiser will perform on the live (on the East Coast), hourlong telecast scheduled for 8 p.m. Saturday, NBC said Monday.

Others set to raise their voices for donations include: Stevie Wonder, Sheryl Crow, Gloria Estefan, Norah Jones, Lenny Kravitz and Eric Clapton, who'll reprise his helpmate role at a Jan. 22 charity concert in Wales.

Clooney's Ocean's Twelve cronies Matt Damon and Catherine Zeta-Jones are among the scheduled presenters, as are Halle Berry, Kevin Spacey, Usher, Uma Thurman and Michael Douglas.

The special will air simultaneously on NBC cable outlets--Bravo, MSNBC, USA, Sci-Fi Channel and Telemundo, included.

Viewers will be asked to earmark donations for the American Red Cross' international response fund.

More than 140,000 people were killed in areas across the Indian Ocean in massive tidal waves that struck Dec. 26.

Other bold-faced types adding their bold-faced names to the relief effort on Monday included:

On Sunday in Texas, country icon Willie Nelson raised nearly $75,000 for the cause through a show. And by Monday in the United Kingdom, nearly all of the 65,000 available tickets for the Clapton-led Wales concert had been purchased. Other acts on that bill include Feeder and Badly Drawn Boy.

Meanwhile, a planned all-star, charity-minded remake of Clapton's "Tears in Heaven," spearheaded by American Idol sniper Simon Cowell and Osbournes matriarch Sharon, remained in the planning stages.

If he's good--or bad--maybe O'Reilly can snare an invite to that, too.