DTP Tools and David Blatner have released the Power Styles plug-in for Adobe InDesign (www.dtptools.com/powerstyles). One of the most popular plug-ins from the Blatner Tools suite can now be purchased separately.
Power Styles provide a way of managing documents designed without a consistent use of styles. Each created style has a generic name based on its difference from the style it is based on. All you have to do is rename the styles to fit your naming convention.
The plug-in is sold for US$59 per license and runs on InDesign CS3-CS5.5 on the Mac and PC. A 14-day demo version is available for download.