I'd like to know what the weight of a million dollars in one hundred dollar
bills would be.  Also, what would it's approximate dimensions be if stacked?

Hello.

A million dollars in $100 bills weighs around 20 to 23 pounds. 

If the bills were in a single stack, estimates put the stack at
approximately 40 inches (3.3 feet) to 5 feet high.  Obviously, if the
bills are in multiple stacks, you'd need to divide appropriately.

From CBS News:
" One million bucks in $100 bills weighs over 23 pounds and would
reach 3 feet, four inches high. "
http://www.cbsnews.com/stories/2005/11/07/national/main1019129.shtml

"a million dollars in $100 bills stands five feet high and weighs over
twenty two pounds."
source: " Why the Global Anti-Money Laundering Regime is Ill-Equipped
to Fight the War on Terror."
http://fletcher.tufts.edu/research/2004/Hasib-Syed.pdf
Citing:
Robinson, Jeffery. "The Laundrymen: Inside Money Laundering, the
World's Third-Largest Business," Arcade Publishing, New York, 1996,
page 10.

"A million dollars is a stack 40-inches high, a little over three feet tall."
http://www.lcurve.org/TRTPart1.htm


"A million dollars in $100 bills weighs approximately 20 pounds,"
source: Ask Marilyn, Parade Magazine, January 18, 2004, cached by Google:
http://72.14.207.104/search?q=cache:qPUe_GHetdoJ:archive.parade.com/2004/0118/0118_askmarilyn.html+%22million+dollars+in+*+bills+weighs&hl=en&gl=us&ct=clnk&cd=9

" One million dollars in $100 bills weighs 20.41 pounds."
source: Beacon Journal, 3/21/05, cached by Google:
http://72.14.207.104/search?q=cache:Dc7uHgkRdKEJ:www.ohio.com/mld/beaconjournal/living/11190713.htm+%22million+dollars+in+*+bills+weighs&hl=en&gl=us&ct=clnk&cd=16

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search strategy:
million "$100 bills" " inches high
million "$100 bills" weights

I hope this helps.

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Clarification of Answer by juggler-ga on 05 Feb 2006 22:05 PST

I notice that you posted your question twice, and that another
researcher also posted an answer.  Please note that my answer above
was posted first (at 20:29 PST on 05 Feb 2006, approximately 36
minutes before the other answer), so I had no way of knowing that
another researcher would post an answer.