*Bug #1:*
Windows 2003 and Windows XP do not like the new Virtual Disk Service cylinder-alignment algorithm in WinPE 2.0 / Vista. You will know you are running into this issue when the machines you have just imaged bluescreen on boot. MS is working on getting updated fixes out for Windows 2003 and Windows XP.
In the meantime, there are 3 workarounds, before creating disk partitions in WinPE 2.0 or Vista:
1. Disable the automatic disk translation in the BIOS of the affected machines
or
2. Force use of the pre-WinPE 2.0 cylinder-alignment policy (no alignment) by setting the following DWORD registry keys to 0:
HKLM\System\CurrentControlSet\Serivces\VDS\Alignment\LessThan4GB
HKLM\System\CurrentControlSet\Serivces\VDS\Alignment\Between4_8GB
HKLM\System\CurrentControlSet\Serivces\VDS\Alignment\Between8_32GB
HKLM\System\CurrentControlSet\Serivces\VDS\Alignment\GreaterThan32GB
or
3. Use BDD/WIM to deploy Vista machines and get rid of the XP images.
*Bug #2 (thanks to Steve6375):*
Deleting 2 images within a WIM without an /append operation in between will corrupt the WIM image overall.
Update on bug #1:
KB 931760 contains an updated kernel for Windows XP to avoid this issue!