Synium Software has released CleanApp 3.4 (http://synium.de/products/cleanapp/index.html), a new version of the uninstaller and system management tool for Mac OS X. It now scans for duplicate files and applications and for empty folders anywhere on your system.
CleanApp requires Mac OS X 10.4.11 or 10.5. It’s Universal Binary so runs natively on both PowerPC and Intel Macs.
CleanApp can be purchased for US$15. CleanApp 3.4 is a free update for existing users. Registration codes of these prior versions will automatically work with CleanApp 3. For new users the cost is US$15.