To understand the software needs of information workers, we conducted a contextual inquiry, revealing that end users? tasks often involve categories of short, human-readable, multi-format data such as phone numbers, state names, and product identifiers [6]. In many tasks, workers copied and pasted data between web forms, often with intervening reformatting. At some points in tasks, users came upon data with questionable validity, prompting them to double-check values (which they sometimes used anyway). One task involved copying data from multiple sources into a spreadsheet, then manually reformatting the data into a common format and manually identifying and removing duplicates.