A lot of good ideas, but I'm not entirely sure why it had to be on Slideshare. The interface wasn't really intuitive to me right away, and I would've liked a paragraph for each heading; either to justify the point or provide examples. In general, being able to scroll down a page is better than clicking next, to my mind.
I know for myself I usually get caught up learning a completely new language. For instance, in the last GGJ I ended up making a game in C# on XNA and ended up barely being able to provide help for my team. However, when on game jams with CSS3 and Javascript at my disposal I can create some awesome things.
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It probably depends on what you want to get out of the hackathon, but I find most of the fun being gaining familiarity with cool new APIs.