It should be straight forward to center it, either with the CSS... or failing that, the JQuery that's already there, I'd have thought.

I'd tend to just use auto in left and right margin of a container div, set to the desired max width... or something like that. I'm no cross browser expert these days. I have a big knowledge gap between web design as it stood about 7 years ago and HTML5 / CSS3. LOL.

I quite like the left align. But I guess centred might be more universally useable.

Nice simple, but full screen, auto-flowing layouts like Pinterest's are really the dog's bits in my opinion though... at present.

DeviantArt's layout is also very well done I reckon... look at those, when you come to revamp Content Paradise, I'd say