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Michael my cofounder at YC demo day.
Pitching at demo day can be stressful. Below are three of the best articles I have seen around on pitching, I recommend reading them all if you are going into a demo day!
- How to Design a Better Pitch Deck by Kevin Hale
- Advice on Pitching by Aaron Harris
- How to Present to Investors by Paul Graham
- A collection of decks that rasied over $700 million by dconstrct.com

Always have your pitch ready.
This is the drchrono slide deck we used at demo day, it will give you some insight into how simple and focused a pitch has to be
[slideshare id=76636581&doc=drchronodemodaypresentation2011-170604193104]