At least, it's new to me. Someone posted one of their videos on Daily Motion, and I followed the trail:
http://growthdreams.com/
Mostly giantess stuff, but there are several BE and Ass Inflation vids. I picked up a few. My favorite is "Boob Light Fun" (http://www.giantesszone.net/eshop/10Expand.asp?ProductCode=gd-65). No plot. One girl points a flashlight at another girl's chest, and her breasts inflate, they play with eachother, the other girl takes her turn- good stuff. Pretty well done, I've gotta say. I like the torpedo shape they take on, as opposed to the all-round inflations we've seen.
Overall, the videos are a bit too goony- I hope they tone them down or make them a little more sexual or more involving the girl's surprise at the experience. Then again, I'd rather see girls giggling about it than looking like someone twisted their arm to do it(not that I've seen that).
Anyway, check them out- maybe give them some feedback. I don't know how long they've been around.
I'll see if I can post some screencaps.
I uploaded some screen caps into the screen cap gallery, but I guess the admin has to approve them. I accidentally double loaded them into the default gallery. Sorry about that.