Contrary to the adage about the old dog and new tricks, even seasoned, longtime booksellers can learn something that improves their businesses. Take Eric Wilska, owner of The Bookloft in Great Barrington, Massachusetts, and president of the New England Booksellers Asscociation: After purchasing business insurance from a private carrier for the past 30 years, he recently switched to ABA's LIBRIS, because, Wilska explained, "I saved a third of the cost for comparable coverage."