Jenny Jones and Maury and Sharon Osbourne are watchable, at times unbearable, but meh.
Queen Latifah puts alot in.
Oprah, The View, The Rosie O'Donell Show, and Dr. Phil are superior shows of Talk that come to mind.
I do watch Oprah everyday religiously for years, and most times a week, i manage to watch The View, and when i get to, Dr. Phil. Ricki Lake has just, well, disappeared from most people's radars.
Rosie i watched when I was in the states. And its since gone off air.
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As for Late Night Talk - Leno sucks, Conan is good at times, and Letterman is the best there is. Essentailly, Leno is a copy cat, just like Rove, taking most of Letterman's original ideas, and so on. I love Letterman, its an awesome show.