In the market for an iPhone? Here's a breakdown of all the currently shipping iPhones from Apple.
Apple Product Cycles as of November 2002
iMac 15" - Jan 2002
XServe - May 2002
iMac 17" - Jul 2002
iPod - Jul 2002
PowerMac G4 - Aug 2002
PowerBook G4 - November 2002
iBook - November 2002
Next major Apple Event - MacWorld Expo SF - Jan 7-10 2003
Update: joed provides a more detailed list of past product updates, including software releases.