Graph-A-Ping, allows you to visually see the ping latency between ping times. The bigger the gap between one ping to another allows you to spot possible network bottle neck. If you need to examine your network more thoroughly you can download more network diagnostics tools at http://www.mataluis.com
Graph-A-Ping, is actually an applet part of Glass Net Networks monitoring console. Glass Net allows you to monitor networks servers regardless of their location. As long as they have a reachable IP address by glass net, you will be able to monitor them remotely. Glass Net has a really cool user interface, and is really friendly to use. Has embedded tools like this one, or the trace a route graph, which allows you to graph a trace route. You can download a demo version of Glass Net from http://www.mataluis.com