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Catherine is the founder & CEO of cashstore.fr, a French cash-back service relying on over 122 partner merchant sites.
How does it work ? You register (free) on the site, click on any of the partner sites, and proceed as usual on your e-commerce purchase using your cashtore email address. She tracks you with the email, and the merchant site tracks the originating click.
Her business model is simple: she negotiates reductions with each partner site and shares the savings with the buyer, keeping approximately 50% of it. On average you can expect to get an additional 5% off any public price + any discount you might get elsewhere for the site. Cashstore will pay you by check whenever you reach 30 euros of cashback.
I recently used her service for buying my new Mac, and I encourage you to make it your first destination whenever shopping online. The company is self-funded, and I hear it will start looking for funds soon. Good stuff.