With nice javascript toolkits out there like dojo, scriptaculous, and YUI there's mind bottling boggling stuff out there that you can do. One of the newest, neat things I've found was a javascript image cropper built off of scriptaculous. A working demo for it can be found here. Credit for pointing me in the direction of this link goes to Thom Wetzel and his post at Shacknews (a non-work related gaming site) who's using it with his gamewith.us community gaming site.