Like, I've had my second comic fanart ever reposted on another LJ and mocked for its slashy subjects, had my HP art reposted on a HP fan message board, found out from someone on my flist that someone else had used one of my slashy Batman sketches for some weird contest thing on a Warren Ellis' site (that person pasted my art into something else, and also removed my sig, so maybe that was "transformative")...

Weird, that's really a lot. I've been trying to think of occasions when it happened to me but the only time I noticed someone reposting my art in full was when someone translated my x-files comic into Russion. And that I had no problem with... since by translating it they added something new to it, I guess, and didn't take away from my own reader base. And they linked and credited.