Looks like there’s been a new category addition to WSUS:
There is a new product category being added to the WSUS Products and Classifications dialog under the product family “Expression”. The new product category is for Expression Web 3.
The Expression Web 3 product category will include updates for Expression Web 3, including service packs, incremental and cumulative updates.
For additional information on the Expression product family, see http://www.microsoft.com/expression.
Microsoft will also be releasing a service pack for Expression Web 3 in the coming months.
For all the details see http://blogs.technet.com/wsus/archive/2009/11/16/new-category-for-expression-web-3.aspx
J.C. Hornbeck | Manageability Knowledge Engineer