I found XXCOPY a ways back when I was looking for a tool to "flatten" a directory (i.e., take all the files out of subfolders and put them all into one big folder). I'd been meaning to point to it, but forgot until this Gadgetopia post reminded me. It's a Really Useful Tool, if you don't mind going old-school command line, with a gazillion options to do anything you'd probably want to do when moving and/or copying files. Also recommended for day-to-day use: SuperCopier2, which replaces Windows native copy function. SC2 lets you choose options like "overwrite all" and will actually tell you if you don't have enough room to copy a batch of files. Things that the OS should do automatically, but somehow doesn't.