Just wanted to drop in and say, while I absolutely love the integrated IPython Notebook view, there are some major usability issues with the plugin. Specifically, the constant re-draws are pretty jarring, and since the plugin doesn't save your position, you have to find the cell you were working on, which can be a hassle when working on large notebooks. Additionally, I really like dark themes for most of my development work, but for the IPython Notebook a light theme works much better; unfortunately you can't theme the IPython Notebook viewer separately from the rest of the IDE. There are also some issues with markdown cell rendering, but this doesn't bother me so much.
Keep up the great work!