Acrobat Pro and Pro Extended offer a time-saving batch processing feature.

Batch Processing allows you to perform many operations across many files. For example, you could OCR, Watermark and Secure multiple files all at once.

Adobe's Tim Plumer show you how to use Batch Processing in this podcast. Since this feature has been in Acrobat Pro for several versions, even owners of older versions of the product will find something of value here.