Jester has a wonderful link in his sig right now:
http://www.coping.org/write/percept/...es/content.htm
I think it's worthy of its own thread, because frankly, there is little logic in most threads, even though much of what is said on AD is patently false, or unverifiably valid at best.
Next time you read something that doesn't seem quite right, and aren't sure of how to defuse the argument, I strongly suggest you take a look at this page and a.) make sure their argument or suggestion doesn't fall into one of these common fallacies, and b.) make sure that any reply you make doesn't do the same.