Plot supports now zooming and editing of data and has been ported to wxWindows.
The latest release (pplot-2003-10-04) features interfaces from ruby and python to pplot. This means that pplot has become scriptable, thus making it more flexible: with your script you can dowload the latest stock market information, perform some operations on it, and view the result in a pplot widget.
Now there is a wrapper available to interface with the script language ruby to pplot. The way to use it is just as in c++, except that you can use native ruby arrays, making it very convenient to use. Needless to say it does not matter whether you are using a qt, cocoa or whatever implementation of pplot on a particular platform.
Thanks to Drew McCormack, Portable Plot can now be integrated in Max OS X applications.