Dev Tools for Quick Mockups

Just so that I don't forget about it now:

1. JSBin makes it easy to mockup some real HTML with some real JS and see the real result, then iterate through it with versioning.
2. BL.OCKS.org will take your Github gist and render it for viewing.  Here's the blurb:  "This is a simple viewer for code examples hosted on GitHub Gist. Code up an example using Gist, and then point people here to view the example and the source code, live!"