The idea behind the "Feats of Personality" article is that the standard feats from the PHB can give insight into characters by asking things like how a feat affect how they behave or respond to things, what they had to be like to take the feat, or how do others view them because they have it. It gives three paragraphs to most of the feats (or groups of feats, stuff like the mounted and ranged weapon feats are addressed together), the first paragraph makes some general comments, the others give good and bad things it may indicate about a character's personality. It has three sample characters, and a list of multiple keywords that can be associated with particular feats.
Though a lot of experienced gamers might dismiss the advice as obvious (though I doubt they'd think of all the suggestions on their own), this could be useful for a lot of people.