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Nokia is leaping into the mobile advertising arena with its plans to acquire Enpocket, which sprinkles mobile Web pages with video and banner ads. With mobile phones seen as one of the great unmapped frontiers of advertising, Nokia is preparing to battle with other prospectors like AOL's Third Screen Media and Google, which just announced AdSense for Mobile. Of course the big problem, as Advertising Age points out, is that consumers are hardly begging for ads on their phones' cramped screens. But advertisers are attached to the long-held vision of location-based advertising, stalking their customers through the streets, pinging them with coupons for nearby stores.