Image Sorting programs

Looking for software to use to find duplicates in my image dirs.  I don't want them to be autodeleted though, something that will go "hey, image one and image two seem to be the same thing" and let me say delete or not.  Would be best if it can do a bit of directory depth as well, as in it could scan all folders in a /image/ for dupes, not one subfolder at a time, ect.  Suggestions please people.

I used to use Check Identical Files (http://www.abc-view.com/cif.html). It does everything you want, but it's shareware.

I could be wrong, but I think that program just checks based on filesize/date and maybe some other stuff. ImageDupeless (http://www.imagedupeless.com/en/index.html) will check them based on content and it works really damn well.

Dup Detector: http://www.prismaticsoftware.com/Utility/Utility.html

Freeware and quite powerful. The interface could be improved though.

and additionally, www.uniquefiler.com

http://elonen.iki.fi/code/misc-notes/remove-duplicate-files/ worked great for me

For BSD UNIX: (NetBSD, OSX, at least)
$ find . -type f -print0 | xargs -0 md5 $1 | sort -k 4 | tee /tmp/foo. | sort -k 4 -u | diff - /tmp/foo. | grep "^>"

Linux/GNU textutils:

$ find . -type f -print0 | xargs -0 md5sum $1 | sort -k 1,1 | tee /tmp/foo. | sort -u -k 1,1 >/tmp/foo.1; diff /tmp/foo.1 /tmp/foo. | grep "^>"

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