There is the Geek Article system and Cinq's article system.
if u want an heavy duty with more functions choose Cinq's system.
If you want something that will be as a post(but in an article look) than choose the Geek one.
I have to recommend Cinq's Article System - It is by far the better of the two in my oppinion. Not to mention once version 1.03 comes out with the new features he added it's going to be a pretty powerful system.