Update Rollup 1.0 for Windows XP Embedded enables OEM customers to use some of the latest Windows Vista components on the Windows XP Embedded platform, including Internet Explorer 7, Windows Media Player 11, User Mode Driver Framework, Remote Desktop Connection 6, and .NET Framework 3.0. It also includes hotfixes for Windows XP Embedded SP2 Feature Pack 2007. The Update Rollup 1.0 for Windows XP Embedded is not a stand alone product; it requires the developer to have Windows® Embedded Studio tool suite installed.
Here's the two installer locations.
The Update Rollup 1.0 contains the bits that you may have known as "Windows XP Embedded Service Pack 2 Feature Pack 2008".