Winetricks is a WONDERFUL tool for those of us relegated to a few windows programs on alternate platforms. I have never had issues on Linux, but on Mac the tool never seemed to work. For some reason installation with either macports or fink did not include the dependcy of md5sha1sum. Install that and you will no longer get the errors about mismatches!
sudo port -v install winetricks md5sha1sum
Credit to Tw3aky: http://forum.winehq.org/viewtopic.php?p=47908#47908