Review my startup (vivapixel.com) 
thepanister: It looks interesting...
But can you please make a demo video, or make a demo version that would allow us to make a fast test without requiring creating an account?EDIT: Also consider providing users a way to transfer their photos from their current service to yours, and to share the photos through multiple platforms... such as facebook.Also consider letting users to login using their facebook account - Facebook connect.Also if you require users to sign up, then consider making a small registeration form at the front page, to accelerate the signup process, and make users feel it's easy to do.EDIT: If you are interested in learning about the user's experience, then consider adding a feedback form, that's easy to be filled.