First, I wanted to say I saw this a while back and loved the idea. You've done an excellent job all around and should be proud of yourselves! I just installed it and I'll see how it goes. I bookmark a fair amount of coding/tech related bits...
Regarding the pitch, I'd say it's already pretty polished. You are good at pitching and execute on the basics: what the problem is, who has the problem, how you solve it, how you think you are going to make money, and what you want from the audience. If I have to give feedback, it would consist of suggesting removing any distracting content, including showing all the cluttered folders at the beginning and then speed up the fairly slow explanation and the speed up the demo of dragging and dropping things. You could probably trim 30 seconds from the pitch without losing the intent and still demo the feature: bookmarking small bits of information is currently difficult and TIME CONSUMING. Dragdis fixes that. FWIW, I see a (downvoted) post at the bottom of the comments mentioning Dragdis helps him make a cluttered mess faster. He may be right...
Second piece of feedback (because you asked!): stop moving around so much. I LOVE LOVE LOVE the two hands to the head movement, but coupled with the pacing and other arm movements, it's distracting and too much. Marketing is about raising interest in your product. Raising interest in something else (like, why is this guy pacing?) takes away interest in the audience. Practice and confidence usually remedies this.
Lastly, I have a feature request: A folder that auto Tweets things I drag to it.