Common Themes in Printz winners?

As a debut author and a relatively new writer, I'm still learning my way around the publishing universe. There are a variety of awards that are bestowed upon worthy books each year, but to be honest, I don't know what half of the awards are for.  There are a few big ones that I know, one of them is the Printz.  YALSA defines the Printz as follows:

"The Michael L. Printz Award is an award for a book that exemplifies literary excellence in young adult literature. It is named for a Topeka, Kansas school librarian who was a long-time active member of the Young Adult Library Services Association.  The award is sponsored by Booklist, a publication of the American Library Association."

The winner of the 2010 Printz was Paolo Bagalupi's SHIP BREAKER:

I recently stumbled across an interview with two YA librarians ( Emily Calkins and Joel Bruns) who were discussing the findings of an article by The Journal of Research on Libraries and Young Adults that had identified six common themes within the first ten Printz winners:

Journeys (literal and figurative)

Teen angst leading to self-actualization

Family relationships

Romantic relationships

Controversial topics

Diversity

While it seems that most YA novels include several of these themes, it's interesting to read their conversation of which books they think strike a chord with majority of these, and which theme is most prevalent in the current crop of contenders.

Do your favorite new books fall into these categories?
Which theme do you think is seen most often in recent books?
Any other themes that you think should be added to this list?

Thanks!
~Kiki