It seems that PC-based data graphing for Arduino is all the rage this month, and thus we have another example by Arduino forum member "zitron" who has published his data graphing software "Dataplot3". Written in Microsoft Visual Studio, the main purpose is to display values over time. It relies on the Arduino sending numerical data seperated by commas and sent via the serial line back to the PC. It's simple and it works, for example:
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If you're new to Arduino, the first step is a solid board for your projects - our Freetronics Eleven - the Arduino-Uno compatible with low-profile USB socket, onboard prototyping space and easy to view LEDs: