Multiple targets for ping
I see some issues with the timers for multiple pings at once, and the graph sometimes behaves weird. Also I would like to keep the customizable intervals per ping. This is possible, but would require stacked graphs I think, or multiple horizontal scales per ping.
Also the added listbox doesnt fit really well in the style yet, and doesn't have a right side anchor so it bugs when resizing. This should be an easy fix :)
The worst part so far is that force-stopping the process makes Windows crash in combination with some network drivers:

This only happens when using some versions of .NET 4.0 (it triggers a bug thats fixed in the preview versions already) but at least its not release-worthy yet until Microsoft fixes this.
Oh and thanks for renaming the form! Much better named as pingform ;-)
I'll work on this a bit more soon and see if I can make it releaseable!