2011 Tree Stats:
Type: Norway Spruce
Height: 74 ft.
Width: Approximately 35 ft.
Lights: 30,000 LED lights on five miles of wire
Swarovski Star on Top:  9.5 feet in diameter, weighs 550 pounds
Drinks: 90 gallons of water per day

Weight: The star and the water in the tree alone weigh 1301.5 pounds.  Lights will probably add another 3,000 pounds or so.  The tree itself weighs in at over 12 tons.  Estimated total weight 15 tons.

Conclusion: The 2011 Christmas Tree at Rockefeller Center weighs more than me.

Want to look at a slightly more manageable tree?  Check out THIS post on managing holiday expectations.