Universal wishlist apps have been done many times in the past (wishli.st for example, financed by the Difference Engine accelerator a few years ago). On paper t

Universal wishlist apps have been done many times in the past (wishli.st for example, financed by the Difference Engine accelerator a few years ago). On paper they're a grand idea - you have an easy revenue stream based on proved techniques through affiliates, the benefit to the retailer is obvious, the benefit to the user _seems_ obvious, so how could it fail? The problem is simple: people like to choose presents for their friends. Wishlists aren't actually very popular. Solve that problem though, and you could be on to a winner.