2003?
I think they were still using multi color gum drop G3 iMacs at that point or at most, they were using the all white dome G4 iMacs. Since the switch to Intel, it is my observation that the update times have become more consistent. If you need a new computer now and the current iMacs meet your needs, you should get one. If you are one of these people who keeps waiting for the newest model, you will most likely find yourself using the same computer for years and years until it dies.
I don't think updating it 4 months after a previous update is unheard of...In 2003, Apple updated that iMac in September, then again in November.
In Previous years, the iMacs were updated (mid year) as follows (minus early year updates):
2003 - September
2004 - August
2005 - October
2006 - September
2007 - August
So if following this pattern, maybe they would be updated in October?
I think they were still using multi color gum drop G3 iMacs at that point or at most, they were using the all white dome G4 iMacs. Since the switch to Intel, it is my observation that the update times have become more consistent. If you need a new computer now and the current iMacs meet your needs, you should get one. If you are one of these people who keeps waiting for the newest model, you will most likely find yourself using the same computer for years and years until it dies.