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Optimal pricing of close to zero marginal cost content
With near zero marginal cost, and infinite supply, your prices are going to be decided by entry cost, competition, and what the market will bear. Generally speaking, though, there are no accurate models for getting these kinds of optimal prices in advance - your best bet is to test, experiment, and then build a business and market specific model based on what you observe.  Look at the Steam network, as an example. They are in the business of selling 0 marginal cost software (games), in a market with a significant but quickly decreasing entry cost, and with solid competition. Despite being around for years in a mature market, they're still discovering unexpected optimal price points when testing how their customers behave.