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For those of you wondering what exactly Light Table is, I found this video to be a good introduction: http://vimeo.com/40281991

Going to the site trying to get a TL;DR about what it is and then the information is a 4.5 minute video. That's not gonna happen.

TL;DR - It's an IDE with support for live coding. It's built with ClojureScript and has a number of unusual good properties.

However, you really need to see the video to understand how viscerally awesome it is.