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Centering everything
Avoid centered layouts
Warped or Naked Photos
Keep photos proportionate, use hairline rules to border photos that have ambiguous edges
Too Many Fonts
Stick to two fonts per layout
Bulky Borders and Boxes
Use negative space to group or separate things
Cheated or missing margins
Be generous with margins, including inset and offset for text and picture boxes
Stairstepping
Keep headlines in a straight line
4 Corners and Clutter
Clutter: Bad. Clustering: Good
Trapped Negative Space
Push extra negative space to the outside edges of your layout
Busy Backgrounds
Design backgrounds as negative space
Tacky Type Emphasis
Think twice about reversing, stroking, using all caps or underlining
Bad Bullets
Use real bullets for lists, and use hanging indents to properly align lists.
Widows and Orphans
Avoid inelegant breaks at the bottoms and tops of legs of type
Justified Rivers
Avoid unsightly rivers of negative space flowing through legs of justified type