Cupoco, a mobile couponing system from Estonian start-up GEOVoucher will announce tonight a marketing campaign, where you can win an iPhone 3GS simply by promoting Cupoco in the social web. There will be a raffle on their website starting from 18 pm tonight.

Cupoco application platform is aimed for smartphone users, merchants and service providers. The idea is simple: to bring them together.

Service provider, for example a restaurant, hotel or publishing house etc can easily (in five minutes) create e-coupons, bonus cards, recommendations or hot deals that the smartphone owners could use. These are distributed directly to the mobile phones of target customers and redeemed with a virtual barcode. Service provider can easily track the feedback.

Marc Böhret from GEOVoucher says that Cupoco will first be launched in Germany, although the service is developed mostly in Estonia. Talks are ongoing with several different companies, but these are yet to be disclosed. Böhret believes there’s an enormous market potential of e-coupons in Germany and Estonia as well.