Reverse Address 

 Reverse Address (USA)

Find out what your neighbour's name is, the easy way!
U.S. residences only.

• Mail Drops - database of address which are used for forwarding mail. Another one is here
• Partial address?? - use this tool to find every USA street with the name or zipcode you enter
• Find the billing address belonging to a US PO Box

 Finding a New Address (USA) 

If they have moved address within the last 6 months, they may have left a forwarding address with the postal service. Try this trick:
Send a letter in the person's name to the last known address with this message typed on it:

RETURN SERVICE REQUESTED

This letter will return to you with the US postal label having the new address (make sure you have your return address on the letter). More info

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Many states and counties have tax assessment property details. They list the owner, who often is not the person actually residing there.

 More Resources 

• Argentina - reverse phone and address search
• UK - this post code finder will list every business in a street
• UK - enter the postcode and get all the phone directory listings for it (should be less than 100)

Phone Directory CD-ROMs - many countries have these. The more expensive versions are sold to market research and telemarketing companies, and have search capabilities on any field (name, address, phone number). At present I do not have any links to these - try eBay, or searching your local Google for "phone CD-ROM".