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how to design and impelemnt a search algorithm

I have a postgres database with one table storing:
street number
pre_dir (such as north, south, etc)
a field for a street name
post_dir
suffix (pulled from a list of options.  such as beach, blvd, street etc)
unit #
city
state
zip
borrower first name
and last name

i would like to write something that would catch possible dupes, and i was thinking of using levenshtein distance.  does anybody have any suggestions on what else can be done?
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tansofun
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tansofun
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ozoCommented:
You might want to start by normalizing the address, making sure any abbreviations are consistent
Then you might check it the address against the post office data base
http://www.usps.com/ncsc/addressservices/addressqualityservices/addresscorrection.htm
(I'm guessing based on state zip that these are USA addresses)
Do you want to catch typographical errors and misspellings?
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tansofunAuthor Commented:
usps is a great suggestion.  it'll work most of the time;we also deal with addresses that are new and usps may not have them yet, oddly enough.

do you have any suggestions on typo's?  I don't really want to build any big n-gram tables and things of that nature.
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ozoCommented:
Levenshtein distance basically counts typos, so it could be useful.
A more sophisticated model may give higer probabilities to substititions of adjacent keys,
or letters that sound alike.
If your last names are European, soundex may be useful for matching them
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