In this modern world are most information on the internet. It's powerful medium and we can found there interesting stories. These stories deserve attention and therefore there is a Pulitzer.
Photo by: Jan Marcinek 
Which stories are winners?
Ian Fisher: American Soldier
This story is about one boy journey from high school to Iraq war. It is very gripping tale made from photos, video and words. You can view website about him here.
Iraq stories
Journalist Anthony Shadid wrote collection of stories about Iraq. But this is different way of storytelling. He made photo slideshow that say it all, where words are not enough.
Anatomy of a Burger
Hamburgers are dangerous! But how much? New York Times wrote story and made graphic about that. You can watch it here.
Stephanie Smith, 22, was paralyzed after being stricken by E. coli in 2007. Officials traced the E. coli to hamburger her family had eaten - The Burger That Shattered Her Life
Fatal Distraction
Raelyn "Lyn" Balfour, now expecting her fourth child, accidentally left her son Bryce, in the back seat of her car in her workplace parking lot in March 2007. The 9-month-old died of hyperthermia. (Source)
Photo slideshow of grieving family members is very sorrowful. It's about parents whose children died after being left in cars.
The Deadly Choices at Memorial
Photo by: Paolo Pellegrin
Not only the people have their own story even the buildings. This story is about ordeal one hospital during Hurricane Katrina. You can find interactive pieces, timelines, and graphics and compelling video.
Cashing in on Kids
The Journal Sentinel has spent more than a year investigating the $350 million taxpayer-financed child-care system known as Wisconsin Shares and uncovered a trail of phony companies, fake reports and shoddy oversight.
Driven to distraction
Pulitzer prize for online game? Why not! In this interactive game, you can see how would you fare while driving distracted. Studies say that drivers using phones are four times as likely to cause a crash as other drivers. So... try it!
Nice article Jan. Indeed, I think it is really important that Pullitzer is now opens to online journalism. It seems a bit normal to me. Among all the pieces you have listed, the one i prefer is certainly “American Soldier” that I already knew. That’s a great piece
@Pierre: Thanks. You have right. Maybe we have online Oscars for movies next year
American Soldier is my favorite online project too, but i like The Deadly Choices at Memorial.