Riddle me this: What do Madonna, Bono, President Bush and Prime Minister Blair all have in common? They want to help poor Africans, that's what. But how to do that is the rub. Madonna has signed up for the latest Bob Geldorf concert series to heighten "awareness" of the dire African situation. She will join Paul McCartney and other pop stars in a series of shows next month. This is a nice, if somewhat fuzzy, idea. The last time Geldorf swam into these waters, in 1985, his "Live Aid" project raised about $150 million dollars for Ethiopian famine victims. The...