If you mean the current unibody one and the previous non unibody one then: Current iMac - Unibody design (All made from one slab of aluminium that has been cut) - You now get 21.5" or 27" screen sizes - Nvidia graphics swapped for ATI ones, Old iMac - Was made of aluminium but didn't have a unibody design - Used to come in 20" and 24" sizes only - Contained Nvidia integrated graphics --- If you mean the aluminium one and the plastic one: - All aluminium design on newer models - Larger screen sizes (21.4" or 27" as opposed to older 17" and 20") - More ram (4GB standard now as opposed to older 512MB) - Larger standard hard drives (500GB as opposed to older 160GB) - ATI is standard on latest iMacs as opposed to Nvidia, ATI and Intel versions on older iMac - Latest iMacs have more processor cores (Dual {2} as opposed to single core on older iMacs) Hope that helps. Wasn't dure which version of iMacs you were asking about. Check out the sources as they have lots of info to help you out further.
Good luck.
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