Just to clarify, re Word:

Word is especially useful if the form is to be filled in by multiple users who don't have access to the PC on which the data might be stored or if you don't plan to add the data to a database or worksheet. In the latter scenario, PDF forms are equally useful and, given that most PC users have at least Adobe Acrobat Reader whereas they might not have Word, more widely accessible. Word forms are relatively easy to extract data from for loading into a database or worksheet.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]