I had the same question - apparently, you have to download a tool to view the current SP level:
http://support.microsoft.com/default.aspx?ID=KB;EN-US;Q318785&http://support.microsoft.com/directory/article.asp?ID=KB;EN-US;Q318785&
OR follow the manual instructions on that page.
My version after installing the latest is 1.0.3705.288 - apparently the '288' designates the SP2...
>I installed SP 2. Where is the SP reported. How do I find out what SP I have.
>John