How does facebook do inplace "moving" about of profile pictures?
To see what I'm talking about, goto: http://www.facebook.com/editprofile.php?sk=picture --> Edit Thumbnail --> Notice that you can move the thumbnail picture about.
They're calling it "ProfilePicSquareEditor" (their source code is hard to get at)
This is not exactly what Facebook uses but it does the trick very well http://odyniec.net/projects/imgareaselect/
I'm currently using it in a couple of projects.