“Piper Jaffray analyst Gene Munster took a lot of heat back in June 2007 when he predicted, three weeks before Apple even began selling the iPhone, that the company would be shipping them at the rate of 45 million a year by 2009,” Philip Elmer-DeWitt blogs for Fortune.

“But Munster is sticking to his guns, and on Monday released a detailed report to clients in which he lays out the steps by which he expects Apple (AAPL) to hit his target — quadrupling 2008 sales,” Elmer-DeWitt writes.

• By introducing a 3G iPhone within the next 3 to 6 months
• By offering a family of 2 to 3 iPhones — including lower-priced models selling for $200 to $300 — by Jan 2009 at the latest
• By entering new countries, effectively doubling the addressable market every year for the next two years.
• By adding new features, such as games (Tiger Woods Golf, played by swinging the iPhone?) and remote purchases (Starbucks lattes without the wait?) starting in June.

Much more in the full article here.