A320 with 180 pax, Airbus OEW (normally too low) and some remaining fuel is ~60 tons, maximum MLW is 66 tons for several weight variants.
Landing Field Length requirement would be ~4000-4500ft for dry runway.
The severeness of the impact implies that they attempted a go-around or at least had some extraordinary issues (compare A310 crash/overrun in Russia some time ago).
Photos from Monsieur airliners.net
Here a got shot of the place. You can see the building with "TAM" written on the side.
http://www.airliners.net/open.file/1056400/L/
Here an overview to give an impression. Crash area is on the left side.
http://www.airliners.net/open.file/0634881/L/
Here another one with a better view of the steep end of runway 35L/17R.
http://www.airliners.net/open.file/0297560/L/
This looks like the place, but only the taxiway leading to it.
http://www.airliners.net/open.file/0018003/L/