I found a free checksum app that suits my needs called HashTab There is one snag, it comes in an "installer" package and it wants me to enter my system password to install the app. Am I right to be cautious about entering my system password for a free app. A couple of other reasons why I am a little cautious. On the site I found it on it there are only acouple of people using it. And the same goes for macupdate Am I being paranoid?