SET: Bono, 41, and U.S. Treasury Secretary Paul O'Neill will visit four African nations on an 11-day fact-finding journey starting on May 20. They will assess the efficiency of development aid and to push for greater economic productivity, the Treasury Department told Reuters on Tuesday . . . SAVED: Jason Priestley, 32, escaped injury after he was involved in a two-boat collision at the Fountain Miami Super Boat Grand Prix last weekend, reports the Miami Herald. No one involved was hurt, but both boats were forced to quit the race. "It wasn't scary at all," the former "Beverly Hills, 90210" star told the paper. "When it became clear we were going to make contact, my job was to avoid flipping over" . . . SUED: Kid Rock, 31, has been slapped with a copyright infringement lawsuit by Microhits Music over his song "Cowboy," reports Billboard. Microhits claims that Rock used a substantial portion of the '80s club song "I Wanna Be a Cowboy" by Boys Don't Cry (to which the company holds the copyright). A spokesman for Rock's label declined comment . . . FETED: "High Crimes" costar Morgan Freeman, 64, will be the guest of honor at AfroFest, Brazil's first Afro-Brazilian/African-American film festival, which starts in Rio de Janeiro this Thursday and runs through May 2, reports Reuters. He'll reportedly introduce his latest picture to open the fest . . . DIED: Advertising visionary Jay Chiat, 70, whose firm Chiat-Day created the Energizer bunny, Apple's "1984" commercial and the Absolut Vodka print campaign, died in Los Angeles Tuesday after a lengthy battle with prostate cancer, says The New York times. Chiat is credited with making Super Bowl Sunday a Super Bowl for the ad industry . . . UNCOVERED: Nearly one in two Americans use their computers while undressed or in their underwear, reports USA Today about a poll conducted by Intel of Internet users over the age of 18. Among the discoveries: Some 81 percent of those surveyed use their mobile PCs in front of the TV, 60 percent use them in bed, 54 percent while eating -- and fewer people use the machines in a casino, shower or while getting a massage. Stands to reason.