Lossless JPG editor?

There is no such thing as a lossless JPEG editor, since JPEG uses a lossy compression algorithm. The solution is to save to PNG to prevent further loss (and lose any compression savings the JPEG format had), or max the JPEG compression quality settings and hope it doesn't hurt the image too much. I stand corrected, lolwhoops. How does it compare to PNG?

Now, as far as freeware editors that do a "little more than rotating", there's Paint.NET or GIMP (if the format doesn't open initially, there are plugins out there). I prefer Photoshop, but it's not exactly free, durr.

Jam it back in, in the dark.