We're winding down on code changes. There are just a couple of things this pass to make logging more usable. The log file doesn't have to exist before you start logging, and the date and time have been reformatted to be easier to use by customer request.
You can download the free demo installer for PingGraph from here, or download a .zip file here in case you have a firewall that blocks executables. Give it a test run to make sure it meets your needs on monitoring your network, then buy a license to enable all the features.