IIS 7 did not carry over many of the VBS scripts that IIS 6 came with. In particular, IISAPP.vbs which was a tool used to list the running worker processes, is no longer available on IIS 7 / Windows Server 2008. IISAPP.vbs was often used to determine which IIS process to attach your Visual Studio debugger to.
Fortunately, AppCmd.exe, which is a more powerful tool, can be used to accomplish the same task. For instance, to list the running worker processes, issue the following command: C:\Windows\System32\inetsrv\appcmd.exe list wp
A good write up on AppCmd.exe can be found at: http://learn.iis.net/page.aspx/114/getting-started-with-appcmdexe
