I downloaded the ColdFusion v7.0.2 Updater this morning. Since I've had some problems recently with downloading CF updates from Adobe.com, I decided I'd verify the MD5 checksum. This made me realize I didn't have a good Windows application for verify the MD5 checksum. After searching Google for a few minutes, I came across a very small (97k) application called MD Checker v2.20.
Using the program is very straightforward—just unzip to a directory and run the md5.exe executable. No installation required. To compare a checksum against a file's checksum, select the "Verify an MD5 checksum" (which is the default option.) Next, copy the MD5 checksum into your clipboard and click the "Paste" button—this will put the MD5 checksum value to verify against in an uneditable control. To verify the checksum of a file, click the "Browse" button and find the file on your hard drive and click the "Open" button. The application will then report the checksum found in either a green (if the values match) or red (if the values differ) box.
This program is very straightforward and best of all, it's free.