^ This is my main question with the site as well: what differentiates this from other bookmarking sites such as del.icio.us?

Hi, we see it as being a simpler more stylish alternative which appeals to technical and non-technical people alike. We also distinguish between the sites you might traditionally store in your browser favourites versus the articles and blog posts you might view and store via delicious. So somewhere in between the facilities you get with a browser and an application like delicious. We also provide the facility to bookmark pages for viewing later or to tweet a link straight from a bookmarklet.