The handful of BookTV tapes I've seen contain the expected talk show, but also news and magazine programs featuring stories about everything from government confiscation of underground comics to the ascendancy of fast food (pegged to Eric Schlosser's ''Fast Food Nation'') and a behind-the-scenes look at the tough-guy filmmaker Bruce MacDonald creating a ''tribute literary video'' to the poet Ann Carson.  The producers go on location to Milan to interview the editor of Italian Vogue, and to Turkey to talk with writers who have been harassed by the government.  All this is inventively visual, with the dead spots trimmed out and the rest spiced up with archival footage, evocative graphics and energetic music. 