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News reports vary as to exactly how many souls were on board, but initial reports suggest that the number may be at least 150. Some stories also suggest that people in or near the buildings into which the aircraft crashed may have been injured, but there is no official word on casualties or survivors at this time.
There is some early video of the accident scene on the CNN website.
I will post details or new developments as they are confirmed.
UPDATE July 17, 2007: It has been confirmed by officials at TAM Linhas Aereas SA, that the flight number of the accident aircraft was TAM Flight JJ 3054 from Porto Alegre to São Paulo, and that there were a total of 170 passengers and six crew on board. TAM airlines said relatives of those who may have been aboard the flight can call the Brazil toll-free number 0800 117900 for information. The airline promises to post updates on its TAM Informa page as more when more information becomes available.