Piper Jaffray analyst Gene Munster has released a detailed report about how he sees Apple quadrupling its 2008 sales and hitting the 45m figure he had previously predicted.

These are the key elements:

– Introducing a 3G iPhone within the next 3 to 6 months
– Offering a family of 2 to 3 iPhones – including lower-priced models selling for $200 to $300 – by Jan 2009 at the latest
– Entering new countries, effectively doubling the addressable market every year for the next two years
– Adding new features, such as games and remote purchases starting in June.