http://www.theopencd.org/md5sum.exe
Yes, you can use the md5sum program to create md5 checksums and verify files not only for RedHat CD images but for every file imaginable. It's very neat, really.
If you have a couple of files along with a md5sum.txt (it can be called anything) file and you want to verify the files, type
md5sum -c md5sum.txt, where md5sum.txt is the file containing file names and checksums. If you want to create an md5 sum file from a set of files, say a couple of mp3's, you could do this:
md5sum *.mp3 > md5sum.txt to create an md5 sum file that you or others can use for checking the integrity of the files in the set.
Håkan