Features:

• Easily, quickly, and reliably compare and synchronize two folders, two drives, or two computers.
• Safely backup photos, emails, contacts, and documents.
• See the exact text differences between two text files, Excel spreadsheets, Microsoft Word, Adobe PDF, or RTF documents.
• Find and remove all duplicate files on your machine. Even if their names are different!
• Much more!

Editor Reviews:

Product Description:
FolderMatch is an award-winning utility which compares and synchronizes two folder trees or two files. Foldermatch won "Best Overall Utility" and "People's Choice" SIAF awards in 2002, 2003, and 2004. FolderMatch is "must-have" insurance against loss of valuable data. Never again be stuck with out of date data. Never again lose critical information. FolderMatch ensures that the appropriate versions of all files are retained. FolderMatch is a fast and easy way to stay in sync. Choose from any of eight different ways to compare your files - from the simple date/time method to the advanced 160-bit Secure Hash Algorithm. Differences are shown side-by-side in a graphical, easy to understand manner. Synchronize the files with a button click. Wizards guide you through the process. There are many powerful options to choose from. Simple enough for a novice to use, yet feature-rich enough for a power user to exploit.

Rating : - Excellent product
The best I've used untill now. Friendly and easy to use. I would however suggest a few tricks to make it more practical: automatic window resizing to full screen or back, having the possibility of viewing the chosen files to update inside a folder in the compare mode etc.