Alignment is broken. The title does not align with anything else. Similarly for the three boxes (featured lists, etc.) - they don't align with the title, etc. Just put things in a simple (invisible) grid and everything might just look much better.

Also, the list-details page is very crowded. When I go to the list-details page, I am interested in that list, not everything else. The left and right columns could easily have expandable boxes (unopened by default) for Popular, Featured lists, etc.