Failed to resolve the site ID for 'Office Server Web Services'.

Solution:

MOSS on Windows Server 2008
I have to admit the install of MOSS on Longhorn RC0 went much smoother than expected; I eventually had one little error trying to start Excel Services (not that I really needed ECS at that point; but it was the last step and thankfully makes the Farm Incomplete message go away). The error message is:

"Failed to resolve the site ID for 'Office Server Web Services'"

But it seems it will start just fine if you use the command line; go to love STSADM.

STSADM.EXE -o provisionservice -action start -servicetype "Microsoft.Office.Excel.Server.ExcelServerSharedWebService, Microsoft.Office.Excel.Server, Version=12.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c"