The full with links to the webcomics are here. My favorites:
Elephant Town by Danielle Corsetto (an ongoing comic, I've only read some)
The God of Arepo by Reimena Yee (the opposite of The Giving Tree)
Hold On by Angie Kang (touching, educational, and sad; the fancy display didn't work on my iPad)
Trans Classic Movies by Jett Allen (particularly the one about The Mask)
The Unseen Artistry of Women by Sólveig Eva Magnúsdóttir
Iconoclastic by Ali Fitzgerald (about Susan Kare's creation of early icons for Apple)