Here is a little more info. The install appeared to work on the server that I tried by just typing the full command into the command prompt. I still can not get it working by using the answer file. Here are the results of the cbs.log file.
2008-09-22 11:08:50, Info CBS Pkgmgr: called with: "pkgmgr.exe /n:D:\IISBuild\unattend.xml"
2008-09-22 11:08:50, Info CSI 00000001@2008/9/22:16:08:50.901 WcpInitialize (wcp.dll version 0.0.0.5) called (stack @0x6c9b8504 @0xc9165f @0xc8b8ea @0xc8c368 @0x76944911 @0x770de4b6)
2008-09-22 11:08:50, Info CBS Loaded Servicing Stack v6.0.6001.18000 with Core: C:\Windows\winsxs\x86_microsoft-windows-servicingstack_31bf3856ad364e35_6.0.6001.18000_none_095f6148c74a7a64\cbscore.dll
2008-09-22 11:08:51, Info CSI 00000001@2008/9/22:16:08:51.010 WcpInitialize (wcp.dll version 0.0.0.5) called (stack @0x6c9b8504 @0x6e278439 @0x6e2562a3 @0xa41392 @0xa41ed4 @0xa417cb)
2008-09-22 11:08:51, Info CBS Could not load SrClient DLL from path: SrClient.dll. Continuing without system restore points.
2008-09-22 11:08:51, Info CSI 00000002@2008/9/22:16:08:51.010 WcpInitialize (wcp.dll version 0.0.0.5) called (stack @0x6c9b8504 @0x6e2ae615 @0x6e290dec @0xa41392 @0xa41ed4 @0xa417cb)
2008-09-22 11:08:51, Info CSI 00000003@2008/9/22:16:08:51.026 WcpInitialize (wcp.dll version 0.0.0.5) called (stack @0x6c9b8504 @0x745d1a0d @0x745d1794 @0xa4360b @0xa42be3 @0xa417cb)
2008-09-22 11:08:51, Info CBS NonStart: Checking to ensure startup processing was not required.
2008-09-22 11:08:51, Info CSI 00000004 IAdvancedInstallerAwareStore_ResolvePendingTransactions (call 1) (flags = 00000004, progress = NULL, phase = 0, pdwDisposition = @0x99fa2c
2008-09-22 11:08:51, Info CBS NonStart: Success, startup processing not required as expected.
2008-09-22 11:08:51, Info CSI 00000005 CSI Store 4017528 (0x003d4d78) initialized
2008-09-22 11:08:51, Info CBS Session: 29957325:2159933844 initialized.
2008-09-22 11:08:51, Info CBS Pkgmgr: Unattend Configure: Begin
2008-09-22 11:08:51, Error CBS Pkgmgr: Failed unattend configure: Microsoft-Windows-Foundation-Package~31bf3856ad364e35~x86~~6.0.6000.16386, hr: 0x800f0805
2008-09-22 11:08:51, Info CBS Pkgmgr: return code: 0x800f0805