I know that I do monitor them.. but don't use anything specific, just a spread sheet. No matter what though, your client is going to check themselves, and if they don't see the results you're talking about, they they'll be some explaining to do.
And more than that, if you have an outsourcer (I do) doing some of the work and if they are overseas (mine are in India and Phillipines) then what they see will often be different than what you'll in the USA