I was checking out this new web site by these guys called 280 North. Essentially, they built a web version of Keynote and they are calling it 280Slides. It looks really slick/nice and they did a great job with the UI. Out of curiosity, I called up Firebug to see what Javascript framework was used. I was quite surprised to find a lot of requests for ‘.j’ files. It turns out that these guys loved Ob