Tills D3 Playground
The 1st D3 file from the tutorial
A copied sample of a line graph
My Vespa data as line graph
Ping times from Vietnam to Munich as line graph
Valuable resources I used
D3 Tutorial from Scott Murray
A very nicely written D3 tutorial. Starts from the very scratch, goes up to drawing a scatter plot.
SVG Paths and D3.js
How to draw paths in D3. That's what you want to use for plots and the sort
Building a Multi-Line Chart Using D3.js
Just as the title says...
Multi-Series Line Chart
from the maker of D3
D3 Tips and Tricks
AN online book with pretty good descriptions