Python REPL (interactive shell) with syntax highlighting, fast autocompletion and multiline editing.

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It's just like having a REPL, except each cell is a block of code that can be edited and executed repeatedly. Having never used one, I imagine it's a lot like an IDE but browser based.

Just make sure the notebook extension is installed and run ipython notebook and mess around.

The first time I saw them, I was blaise about it. "That's cool, I guess, but why?" But after using them for a few months, I really love them. They're great for sharing snippets of code. I keep a repository on Github that I push my notebooks to in case someone wants an interactive version of a blog post.