Here are the couple WoW ones that I used to follow:
By Way of Booty Bay
(don't think it has updated in years)
The Daily Blink
Some original art, some from a model viewer foundation.
Dark Legacy Comics
I've never actually read this one but Boubouille links it fairly frequently on MMO-Champ.
I haven't followed this one in a couple years but it looks like it's still going strong. Its world is an amalgamation of multiple MMOs.
Looking for Group