It would really come in handy if there were a single module, or a single module collection, that could be used to validate this kind of thing. There have been occasions in the past where, when validating data for integrity, I have been at a loss as to what might be valid and what might be invalid.

A few ideas:

• Telephone numbers, such that they are both "validated" and optionally cleaned up into the "official" format.
• State, province, district, parish, or other political sub-unit listing, with appropriate abbreviations, and common misspellings linked to proper spellings (i.e. 'KT' for Kentucky to 'KY', 'QC' for Quebec to 'PQ')
• Postal codes, plus any secondary validation that can be performed, such as linking geographic region with the code (i.e. 10001 is in NY, 90210 is in CA)

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