If you click on status (ie The word "status" in that menu, up the top)
I think it shows them in order of all those actually Running
I've spent may many hours on services, and tend to use bare minimum
But this is not normally preferred (even though it makes Windows quick)
The reason why it's "not preferred" is because I turn off things such as Print Spooler, and Help Service. And only enable them when I need them, and so forth.
I've also:
Removed every startup imaginable
Removed every file I can (you know system files, like System Restore, as a basic example)
Removed all tasks from everywhere
Removed all the logs being generated (or at least made them minimal)
Actually, I've had Windows operational at 65Meg only (Anyone who has seen this, knows what I mean - others may say not possible, but yep, fully.
But...
Obviously to run anything like sound or a camera or basically any normal operation (other than Windows and the Internet which is obviously left working) requires all this manual work (enable this, run that) obviously "not preferred".
But it's amazing to see just how little amount of things need to be on, for Windows to work.