Short answer: No.
Not so short answer: No. However, all the publicly visible data is already available, on a node-by-node (or thread-by-thread) basis. Depending on what you want to do, you might be satisfied with the existing internal or external search mechanisms. Or, you could build a spider to retrieve as much content as you want and save it for your own use. But there are two very important points to keep in mind:
Some previous discussions: