CAUTION: You're about to enter the world of Ann Coulter ''How to Talk to a Liberal (If You Must),'' the instant ''New York Times ''bestseller, shows why Ann Coulter has become the most recognized--and controversial--conservative intellectual in years. Coulter ranges far and wide in this powerful and entertaining book, which draws on her weekly columns. No subject is off-limits, no comment left unsaid. She even includes a special chapter featuring the pieces that squeamish editors refused to publish--''what you could have read if you lived in a free country.'' In ''How to Talk to a Liberal (If You Must)''--which features a brand-new chapter special to the paperback edition--Coulter offers her unvarnished take on: - The essence of being a liberal: ''The absolute conviction that there is one set of rules for you, and another, completely different set of rules for everyone else.'' - Her 9/11 comments: ''I am often asked if I still think we should invade their countries, kill their leaders, and convert them to Christianity. The answer is: Now more than ever!'' - The state of the Democratic Party: ''Teddy Kennedy crawls out of Boston Harbor with a quart of Scotch in one pocket and a pair of pantyhose in the other, and Democrats hail him as their party's spiritual leader.'' - The ''Treason Lobby'' ''Want to make liberals angry? Defend the United States.'' - How far the Left has sunk: ''Liberals have been completely intellectually vanquished. Actually, they lost the war of ideas long ago. It's just that now their defeat is so obvious, even they've noticed.'' - And much more