Here's a list of some websites...

A more up to date copy of this FAQ
     http://world.std.com/~giese/pfaq.html

American Numismatic Association  (decent)
     http://www.csd.net/users/anaweb

Krause is now online, although their page is wimpy and undeveloped.
     http://www.tias.com/krause/BankNoteReporter/
     http://www.tias.com/krause/

A good site with images of USA and some World notes
     http://very.simplenet.com/currency/

History of money  (good)
     http://www.ex.ac.uk/~RDavies/arian/northamerica.html

Irish banknotes and coins  (ok)
     http://www.hursley.ibm.com/Ireland/coins/coins.html

Polish banknotes and coins  (ok)
     http://www.personal-engin.umich.edu/~zbigniew/Money/money.html

Slovakian banknotes and coins  (ok)
     http://www.eunet.sk/slovakia/money.html

Canadian Paper Money   (ok)
     http://web.idirect.com/~mjp/mjpcpm.html

World paper Money   (ok)
     http://web.idirect.com/~mjp/mjpwpm.html

Hamilton Coin Collectors page (has links to good pages)
     http://www.hamilton.on.ca/Information/sports/leisure/coin/Index.html

U.S. Bureau of Engraving and Printing  (wimpy)
     http://www.ustreas.gov/treasury/bureaus/bep/bep.html

Minneapolis Fed Site with image of new US $100 note
    http://woodrow.mpls.frb.fed.us

World Banknote Collectors Web Site
    http://members.aol.com/TLWolf/banknotes/index.htm

Smithsonian  (good set of obsolete note images)
http://www.si.edu/organiza/museums/nmah/homepage/numismatics/numismatics.html

  So far, in my humble opinion, nobody has created a truly Excellent
page for paper money.  Take this as a challenge: First one who
gets their paper money web page designated "Cool Site of the Day"
(http://www.infi.net/cool.html) will be forever honored in the
Credits section of this FAQ.

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2. "I FOUND A..." QUESTIONS

  Paper money has both a market value and a personal value.  These
two things are very different.  There are big time dealers who
keep a note from circulation just because it has an interesting
serial number or for other sentimental reasons.  Don't let "market"
forces blur the real meaning of being a collector.