Grading the Conspiracy Theories

Here's an article which attempts to do just that. He's a little bit generous to some of them (LIHOP gets a "B", as does the shootdown of United 93), but on the other hand, he does give Controlled Demolition a "D" which stands for "Possible, but highly unlikely."

Overall a pretty good discussion of the arguments pro and con for each of the major CTs.