By removing System/Library/CoreServices/PlatformSupport.plist, an unsupported Intel based system (Core Solo, Core Duo, or any Mac that's been upgraded to a Core 2 Duo) will successfully boot into Mac OS X Lion Developer Preview. It has no issues running any of the applications (Safari works, for example) and the overall speed of the system is on par and faster depending on spec than its Core 2 Duo based counterpart. (Compared with my Late 2006 CD iMac Core 2 Duo) You should also be able to add the motherboard identifier to PlatformSupport.plist and have it work. The motherboard identifier can be retrieved by booting a Core Duo from a standard Lion install in Verbose Mode, or you can run Primate Labs Geekbench which will give you the motherboard identifier once it's benchmark results have been submitted to their online database. Overall, owners of Core Solos, Core Duos and upgraded-to Core 2 Duos can hope that Apple either keeps this in place until the final release, or even better, their machines won't be obsoleted after all and this is only a temporary measure. Fingers crossed. Credits to mcdermd on the 68k Macintosh Liberation Army forums for pointing out the method of removing the plist to bypass the board identifier check to make it boot on a Core 2 Duo upgraded Mac Mini (Early 2006). After some quick checks on an old iMac Core Duo I had around, i'm pleased to be able to say it works perfectly on here as well.