I would say, finish/fix iPhone support before adding additional platforms. The upside of this would be to allow Android to become a bit more available and allow a userbase to form. It's all supply and demand. iPhones have the highest usage in the smart phone market, even surpassing Blackberries if some surveys are correct.
I honestly think that Android has a great purpose, but it's still too early to say if it will be anything more than a small niche market.
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