True... there are a ton of sites which do almost exactly the same things. But in a non-saturated market there's always room for a usurper with some kind of hook. Be it better usability, just a more stylish interface, or simply better marketing. So I'd say its got a chance.
Saying that, the service is far too invasive for me, or probably most other people on here. We already have enough goddam firefox extensions etc., and already know 1m places to get buzz and social-driven recomendations. But pitch this at the n00b-level, and pitch it well, and it could be a winner imo.