Best Bets on TV tonight

"The Dark Side" (9 p.m., PBS): This latest edition of "Frontline" rigorously examines the debate that went on inside the Bush administration over the goals of the war on terror and the decision to invade Iraq.
"Real Sports with Bryant Gumbel" (10 p.m., HBO): The newsmagazine returns tonight with a sobering two-part installment that explores how the health of youth athletes in many Eastern towns is being compromised because they're playing in the shadows of coal-fired power plants that continue to belch forth way too much pollution.
"Kathy Griffin: My Life on the D-List" (9 p.m., Bravo): The comedian goes to Iraq to perform.