I posted some VB.NET code recently that demonstrated how to do this, but thought I would make a little application for those of you who are not developers and just want a quick simple way of finding out which services are running in which svchost.exe process.
Archives For svchost
I wrote this code primarily to be able to get the windows services running in each svchost.exe process, however it can be used against any process to see which services (if any) are running within it. It makes use of the EnumServicesStatusEx, OpenSCManager, and CloseServiceHandle Windows APIs. If you are not a developer and just want to see which services are in an svchost.exe process, see this post