Something to be aware of for SCCM SP1 Upgrades...
Thanks to Jeff Gilbert for the original post.
“Before beginning the upgrade process to Configuration Manager 2007 SP1, the Windows AIK 1.0 should be uninstalled from the SMS Provider computer for the site to allow SP1 Setup to install Windows AIK 1.1 to support SP1 OSD WIM images.
If the Windows AIK 1.0 is not uninstalled prior to beginning SP1 Setup, and a PXE service point is installed in the site running the Windows Deployment Services (WDS) Server service, the upgrade might fail and result in an unexpected restart and post-upgrade SMS Executive service crashes.”
http://myitforum.com/cs2/blogs/jgilbert/archive/2008/07/22/upgrading-the-windows-aik-for-configuration-manager-2007-sp1.aspx