9/11 Myths Exposed at 911myths.com
911myths.com is great.
Another point you could add is that it is nonsense to claim that steel can never be effected by a fire. This is the implied argument that most 9/11 conspiracy people are making. The simple proof that steel can be damaged by fire is the fact that builders do indeed fireproof steel.
If the 9/11 conspiracy people think steel can never be damaged by fire, how do they explain the fact that fireproofing does indeed get applied to steel in buildings? The problem with the WTC was that the fireproofing was dislodged.
"Ineffective fireproofing and a shortage of staircases were the main reasons for the collapse of the World Trade Center, according to a report released Tuesday and led by Dr. Shyam Sunder, Acting Deputy Director of the Building and Fire Research Laboratory (BFRL) at the National Institute of Standards and Technology (NIST)" http://www.indolink.com/displayArticleS.php?id=040805021055
"The report also says, of the fireproofing knocked off the steel, that "no fireproofing is designed to withstand such devastating impacts.""
The point about the steel failing in the Madrid Windsor Tower is good: "So what does the Madrid Windsor Tower fire show? That steel columns will collapse in a fire, that concrete is more fire-resistant"
Also see this page about WTC 7, WTC 7 was severely damaged and was on fire for hours.