seems like a fantastic idea to me.
note there are similar looking programs which checksum files on your computer and report when one has changed, which can also be very useful for security purposes.
but this program is doing something different - its maintaining a centralized list of official known trustworthy versions of programs, and checking yours against its centralized list, which might be a little troublesome privacy-wise, but seems good from a security standpoint.
[free for personal use].