The last revision of the 15″ flat panel iMac has a 1 GHz G4 processor, a 32x Combo drive, and 32 MB of video memory. Along with the 1.25 GHz 17″ model, it is the first iMac to support USB 2.0.
Apple decided to simplify the iMac lineup by offering just one 15″ model and one 17″ model. The Early 2003 17″ iMac has a 1 GHz G4 processor, a SuperDrive, and 64 MB of video memory.
The 2002 iMac is definitely different with its 10.5″ hemispherical base and 15″ flat panel display. Definitely different. Steve Jobs says the design was inspired by a sunflower.