YA Graphic Novels/Comics

Anyone know offhand of some really good graphic novels for young adults/teens? I'm working on a school project and already have Persepolis, American Born Chinese and The Gunslinger Born (and series), but I'm looking for others and would welcome any suggestions from the collective knowledge here.

Depends on the age group but, while I was skeptical of them at first, I ended up really liking DC's Minx line.

- Smile
- Runaways
- Chiggers
- The War at Ellsmere
- The Eternal Smile

thanks for the suggestions! I poked around earlier but the only one of these I found was Runaways.

Runaways, yes, and try Freshmen by Hugh Sterbakov

Since you have already listed Persepolis (which includes topics like sex, prostitution and drugs, but ends well), I'll include some that include topics that are controversial in some parts of the world. I'll try to include books with reviews:
Nate Powell: Swallow me whole
Alex Robinson: Too Cool To Be Forgotten His Box Office Poison is probably too adult.
Tim Sievert: That Salty Air
Jeff Lemire: Essex County (there are 3 volumes, but there is also 1 collection)
Craig Thompson: Blankets
Paul Hornschemeier: Mother, Come Home
Scott McCloud: Understanding Comics
Marguerite Abouet: Aya There are several books about this young girl from Ivory Coast
Anders Nilsen: Don't Go Where I Can't Follow About the death of his fiancée
Chester Brown: I Never Liked You
Jason Lutes: Jar of Fools (also published in 1 collection by Drawn & Quarterly)
Julie Morstad: Milk Teeth Not for beginners
Michel Rabagliati: Paul has a summer job Also check out the other books by Michel Rabagliati
John Porcellino: Perfect Example
Adrian Tomine: Summer Blonde. Not sure this is YA or just A.
Linda Medley: Castle Waiting 9 Up, but I love this.
Debbie Drechsler: Daddy's Girl: Comics Autobio story about incest
Miss Lasko-Gross: Escape from "Special"
Lilli Carre: The Lagoon
Charles Burns: Black Hole
Brian Talbot: The tale of one bad rat
David B. Epileptic
Jesse Lonergan: Flower & Fade
Andi Watson: Breakfast After noon, Dumped, Love Fights, Paris
Hope Larson: Gray Horses
Bryan Lee O'Malley: Lost at Sea and his Scott Pilgrim series
Mike Carey: My Faith in Frankie
Ariel Schrag: Potential, Awkward and Definition and Likewise

The Love & Rockets books by the Hernandez brothers are very popular by students, but they are not graphic novels and maybe a bit adult (no sex or violence though).
I have found the website http://comicsworthreading.com/ very interesting in selecting quality comic books and graphic novels.
There is a website http://www.teachingcomics.org/ aimed at teaching comics in schools.

Lots of good suggestions.

Some more to consider:

The Arrival by Shaun Tan
The Dreamland Chronicles by Scott Christian Sava
Ghost World by Daniel Clowes
The Rabbi's Cat by Joann Sfar

Wow, thanks for all the great suggestions. A lot to check out there...

Mouse Guard by David Petersen

Pedro and Me by Judd Winick - the biography of Pedro Zamora, AIDS activist and Real World member, written by his Real World roommate and friend.

Maus by Art Spiegelman - documents his father's experience of the Holocaust and his life as a survivor.

Robot Dreams by Sara Varon is a charmer, although it might be most appealing to a younger group than young adult.

Boogeyman would be good for young adults, I think. It's a series of stories of morality tales about fear and what it drives people to do, all told with humour and with great illustrations.

#6: Love & Rockets is among my favorite comic work ever, but it does have occasional sex & violence. Probably fine for high schoolers (but I was reading the very graphic Zap Comix in high school, so what do I know?).