WOW there is some pretty wild speculation here from guys/girls that have never flown a jet aircraft (especially the 737). To clear a few things up, several posters have suggested that the aircraft may have been flying at a speed around 80kts when it impacted. Well the 737 won't fly at 80kts or even 100kts. At these speeds it would have been stalled.
Secondly, to the posers who have suggested that an additional fuel load may have somehow contributed to the accident...this is also not correct (especially the part about carrying centre tank fuel). On the 737 the fuel is always used from the centre tank first (if carried). This is because the fuel pumps operate at a higher pressure.
I guess if you haven't flown the 737 it is impossible to understand the handling characteristics of the aircraft. Having many thousands hours on type I can honestly say that it is a beautiful aircraft that a trained crew following SOPs should have no problem handling during a go around.
I won't speculate, but instead wait for the report.