Steve Martin's entire career, both acting and writing, has been based on his wit and wisdom, so it's no surprise that he lands on the national bestseller charts with Pure Drivel, a collection of new and previously published short humorous pieces. Hyperion had a one-day national laydown on September 16 and launched the book with 265,000 copies in print. Martin's 1979 collection of comic writing, Cruel Sh s, sold more than a million copies in hardcover and paperback combined. He did a surprise appearance on Saturday Night Live, his old stomping ground, on September 26 and his week of national publicity began with a Today Show appearance as well as Charlie Rose, Late Show with David Letterman and Rosie. Live with Regis &Kathie Lee is scheduled for October 13.