The Best Viral Idea I May Have Ever Seen

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Birthday Alarm. You go to the website, it crawls through your address book, sends out an email to all your friends and simply asks them for their birthday. Free sign-up, or users pay $14/yr to have ecards they can send to those friends.

Such a simple idea. Has 50mm users right now grossing $4mm revenues/year. Had 50mm more users years ago — might not be an opportunity to get those other 50mm (given Facebook, Bebo, MySpace these days), but I think there is the opportunity still.

More info at TechCrunch.