It’s hard to remember all the forms of invalid logical argument. Recently, I’ve seen several great guides on this subject. These are both amusing and highly instructive.
Thou Shalt Not Commit Logical Fallacies <- great quick reference. Also, you can order the wall poster if you want to establish some basic ground rules for your office 🙂
An Illustrated Book of Bad Arguments <- a more in-depth reference with amusing illustrations. I really like this one. (Thanks for pointing this out Jack!)
P.S. It may just be coincidence but I haven’t heard “beg the question” used incorrectly on NPR’s All Things Considered since I wrote them an e-mail to complain 🙂