I am creating a new poll based on iMac manufacture dates rather than purchase date as I feel this data is far more relevant. You can check the build place and date of your iMac by either entering your serial number here: http://www.chipmunk.nl/klantenservice/applemodel.html Note that this page seems to incorrectly misidentify the build year as 1997 instead of 2007 but aside from that the data appears to be correct. or you can download the following app: http://coconut-flavour.com/coconutidentitycard/index.html Either of these only gives you a manufacture "week" and for the purposes of this poll I used the first day of the week for my own machine manufactured 8/13-8/19 which I classified as an early August 2007 iMac. EDIT: I just realized by a post from someone in the thread that inspired this poll that of course Apple was manufacturing the aluminum iMacs as early as late July to ramp up for the 8/7/07 release. I can't see any way to edit the poll now so I suppose if you have a machine manufactured in late July that you should just choose "Early August 2007 iMac" above.