We received extremely helpful feedback, and are grateful to everyone who commented and used the product. Hearing from readers and new users was exciting, helpful, and insightful. So, thanks very much.
The #1 request was an API to generate plotly graphs from desktop environments. In response to that feedback, we are launching a new service so you can now send data from Python, MATLAB, R, and Arduino to your plotly account. Calls made with the API will return a link with a graph of your data, i.e. something like this: https://plot.ly/~chris/421/. You can sign up through the API.
The graphs are interactive: click-drag to zoom, double-click to autoscale, shift-drag to pan, hover to view data points.
You can view the graphs inside plotly and style them with our GUI. For example, I sent data with the API to make this: http://plot.ly/~chris/554/ and then styled it inside plotly to create this: https://plot.ly/~chris/653/
HN: What do you think of the API? What else can we do to make Plotly a tool that you would realistically use every single day?