How to determine what services are running under a SVCHOST.EXE process
http://www.bleepingcomputer.com/tutorials/list-services-running-under-svchost.exe-process/-- Shared with Google Share Button
Here's a good article on how to examine what services are running under a particular svchost.exe. You can inspect svchost.exe with the excellent Process Explorer from Sysinternals.
Of particular interest is the section on setting the grouping of services via the registry.