Very cool! First impression is the site is great. I think you've hit everything with this site. Unfortunately, I can't use your product because there is no equivalent chrome extension. Is this on the dev roadmap? if it is, make mention of it, as I would definitely bookmark this page and come back.
Love the bring a video with you option. Some thoughts on additional features, can you add a compare to other sites besides Amazon? Perhaps newegg.com for electronics. just some more choices would be great.
What about send a web page thru gmail? I haven't found a really good extension for this. Something that sends the whole article rather than just a link and keeps the formatting.