Here is an update with over 2000 D3js examples.
One of the best things that I like about D3 is the ridiculous amount of awesome demos available online and last night I have stumbled on an excel sheet with 1,134 examples of data visualizations with D3. If you are just starting out with D3 you will appreciate the well organized API docs and really great tutorials and cheat sheets but there is nothing like seeing a demo with code. There are many D3 examples online but I have not seen such a big list published anywhere so I am dropping it below, with thumbnail images of each D3 demo on link mouseover. Here are 1,134 D3 examples:
Instead of adding to this list, here is an awesome organized collection of D3 examples.