A lot of people (myself included) really liked Hootie-Who's work on Tumblr before the blog was taken down. These two blogs are reposting material that wasn't otherwise accessible through reblogs/the Internet Archive:
http://foggy713.tumblr.com/
http://harvzilla.tumblr.com/tagged/hootiewho
The first has mostly BBW/M2BBW transformation, the second is mostly focused on male transformation.