DigestIT is recommended by Netflix for use in their contest about predicting customer preferences for movies.
digestIT has been used by both SuSE and Novell, and has also been used by the Computer Crime Unit of the Montana Division of Criminal Investigation.
* Integrates itself into Windows Explorer
* Simple right-click interface
* Multiple file support
* Quickly verify a MD5 or SHA-1 hash
* Save to file or copy to clipboard
* Native support for 64-bit Windows (x64 Editions)
The only issue of which users need to be aware is what is called the "2GB limitation". What this means is that the progress indicator will not properly display the file size and processing progress of files that are 2GB or larger in size. However, the final result displayed for such a file will still be correct.