This topic really is my forte XD Figured I'll drop one more link
http://mamorme.deviantart.com/gallery/
It's a group I started up on dA because I grew uninterested in your 'mainstream' TFs and I've always been a fan of of the more liquid-like or gooey ways of transformation. Can't say it's the most popular place, but I do drop exclusive pics there every now and then.
Until then, here's a little something I scribbled the other day.