Webyog has recently released MONyog 2.0, a monitoring and advisory tool for MySQL servers. MONyog 2.0 is a major release over their previous version 1.5x. It includes features such as the ability to analyze and monitor data collected over a period of time to look at trends, SSH tunneling, configurable enterprise dashboards to keep a watch on the important metrics, a whole new look and much improved documentation.
MONyog 2.0 can be installed on Windows as well as Linux, and can be downloaded from http://www.webyog.com/en/downloads.php