Not sure if these will meet your needs for binary files specifically, but take a look at DiffMerge from SourceGear http://www.sourcegear.com/diffmerge/. Also there is WinMerge at http://winmerge.org/ and the venerable WinDiff which is available from http://www.grigsoft.com/download-windiff.htm and probably other sites as well.

>I am in need of a good Hex Diff application (to compare binary files). It must be freeware (and not shareware) otherwise my IT department will not let me install it.
>Any recomendations?
>
>Thanks,
>Einar