Google Refine – Power Tool for Working with Messy Data
http://code.google.com/p/google-refine/

Google Refine is a power tool for working with messy data, cleaning it up, transforming it from one format into another, extending it with web services, and linking it to databases like Freebase. This has been added to the tools section of Research Resources Subject Tracer™ Information Blog. This will be added to Data Mining Resources Subject Tracer™.