Software by MD5 Freaks Ltd.:

Take control of your data with FastSum. Fingerprint your vital files now and check their integrity after a network transfer or a CD burning simply by taking the fingerprints again and comparing them with those you made before. FastSum is based on a well-known, time-proven cryptographic algorithm that makes the checking processes very fast. Furthermore, handy step-by-step Wizards, special filters and shell integration make your work even easier.