Apple could see $1 billion per year in iPhone App Store revenues in calendar 2009, according to Piper Jaffray analyst Gene Munster. Often one of the most bullish analysts when it comes to Apple, Munster called the $1 billion figure aggressive in a research note to clients. Munster based his projections on his estimate of a user base of 78 million iPhone, iPhone 3G and iPod touch users by the end …