> PS.  I believe I've heard they plan to extend the zip code from the
> existing 9 digits to 11 digits.
Some bulk mailers already use the 11-digit zip codes.  The last two 
digits are generally the same as the last two digits of your house number 
if you live in a single-family detached unit or a duplex.
      Dave Edmondson
      ghoti@netcom.com; ftp archive ftp.netcom.com:/pub/gh/ghoti
      "Exalted Master, you told us that the world would end yesterday."
      "My child, it did end yesterday, but you're too sinful to notice."