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Original bank note images from: Wikipedia

"Pentagon officials determined that one giant C-130 Hercules cargo plane could carry $2.4 billion in shrink-wrapped bricks of $100 bills. They sent an initial full planeload of cash, followed by 20 other flights to Iraq by May 2004 in a $12-billion haul that U.S. officials believe to be the biggest international cash airlift of all time. [...]
     The cash was carried by tractor-trailer trucks from the fortress-like Federal Reserve currency repository in East Rutherford, N.J., to Andrews Air Force Base in Maryland, then flown to Baghdad. U.S. officials there stored the hoard in a basement vault at one of Hussein's former palaces, and at U.S. military bases, and eventually distributed the money to Iraqi ministries and contractors. Millions of dollars were [then] stuffed in gunnysacks and hauled on pickups to [these] Iraqi agencies or contractors. [...]" — Paul Richter, Los Angeles Times
...via the New Shelton wet/dry
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"[...] According to the U.S. Treasury, 'In $100 bills, the weight of $1 million is about 22 pounds.' [that's 10 kg.]
     So, the area of a single bill is 6.6294 cm by 15.5956 cm which is
.066294 m x .155956 m = 0.0103389471 square meters
     Since $1,000,000 requires 10,000 bills, the total area of the bills is
103.389471 square meters, and the total thickness is 124 micrometers x 10,000 = 1,240,000 micrometers = 1.24 meters.
     So the height of a single stack is 1.24 meters. And the volume of the stack is 103.389471 x 0.000124 = 0.01282 cubic meters
     And since the total area of the bills is 103.389471 square meters, at
a weight of 88.7 grams per meter or .0887 x 103.389471 = 9.17 kg
     Add another .83 kg for the ink and you're back to the Treasury's 10kg. figure.
     So in summary, you can have one stack of bills 1.24 meters = 48.82
inches high, or you can have, say, 4 stacks a little over a foot high,
22 pounds all together, or (if you prefer the metric system) 6 stacks
a little over 20 cm high, 10kg. all together."
— google answers
* CBS News (about the complex design of the new US 100 dollar bill; read more...)