Well, outside of White Lightning Productions titles... The Wotch and El Goonish Shive both have transforming characters but are far more about TG than TF... I struggle to think of any other webcomics that have it regularly. Or at least, webcomics that have anything approaching a regularity of updates.
Shifters has a bunch of were-characters but that seems to be updating on a yearly basis.
Oh, relatively new one:
http://urgentcrisis.comicgenesis.com/
Seems promising.