Yep! Refine Edge, it's Alt Ctrl R
Make a selection, expand it (or whatever), and refine it. I found that smooth being set pretty high rounds edges and blurs the selection. Up the contrast to around 80 and you'll make that blurry selection nice and crisp, but not too much so. Feather and shift set to zero. Just playing around with it you can make some cool effects. Perhaps I'll post a tutorial for it...