Great frontpage and app. I love the integrations and automation section which shows great potential. Few critics and requests:

* Please make the signup box more visible/highlighted. Took me 2s to find out where to signup.

* Your page is catered towards people who already use a bookmarking serivce. Some of the audience may not yet use a good bookmarking service. For eg: I use a history recorder and don't explicitly bookmark.

* Would be great to see an integration with some push to kindle service. I'd signup in a jiffy. (I use fivefilters currently and never actual "read" anything on a monitor).