Here's another great reason for you to take part in the Windows XP Embedded Service Pack 2 Feature Pack 2007 Communuty Technology Preview.
You can access the Image Difference Engine Evaluation tool via the same Microsoft Connect website as the Feature Pack (https://connect.microsoft.com/windowsxpembedded).
The Image Difference Engine allows you to upgrade existing Windows XP Embedded with Service Pack 1 (SP1) devices to Windows XP Embedded with Service Pack 2 (SP2). Using the Image Difference Engine and Image Difference Applier tools (collectively, Image Diff) help you to identify and package only the changed or added files and registry keys and upgrade in the field, without having to redeploy a complete Windows XP Embedded with SP2 image. Image Difference Engine can also help determine and package smaller upgrades, including operating system security updates and hotfixes, configuration changes, third-party application updates, and line of business data.
You can download Image Difference Engine at: https://connect.microsoft.com/windowsxpembedded/Downloads. You can then test the product and submit feedback to us via the Image Difference Engine Bug Report form on the Connect website.
If you have any questions about Image Difference Engine please submit them via the MSDN Windows XP Embedded Newsgroup (http://msdn.microsoft.com/newsgroups/default.aspx?dg=microsoft.public.windowsxp.embedded) clearly stating Image Difference Engine in the header.
Super cool! - If you are not already signed up for the Windows XP Embedded Feature Pack 2007 Community Tech Preview then here's your reason to sign up and download.