Gnuplot is a quite powerfull tool, if you know how to use it. Here are some ideas how to realize solutions for different problems. But these are only the few I took the trouble to write down :-)

Symbols and Line Types

I just plotted a overview of all the line types, colors and symbols gnuplot uses in the postscript terminal.

Web Gnuplot

You are standing at the airport and you want to plot a complex function? You want to plot some data and you don't have a computer? No problem... use my gnuplot webinterface !
Additionally you can use it from your cell phone !