I use gnuplot from the starting of 2002/2003 if I remember correctly.
I used it for thesis (phyisics) and I still use it today for all sorts of graphic needs, mostly for time-based series.
The project seems interesting, i have also a background of network analysis if this can help.
I also used it for real-time graphs display, I don't know if you need it or not.
(pls note that if you click on my profile you can see that I have a 5/5 rating, but on different projects, linux and php)