Just a note about the "NOTE" at the start:
This information is true. If you have "On resume, display logon screen" checked, it will always invoke a screensaver at the set timeout, even if you have selected "(none)".
My reason for posting: this is exactly backwards from XP. I had the screen saver kicking in for quite a while before I figured out that Win 7 is being too smart with this.
To get actually no screensaver, one must select "(none)" and uncheck the "On resume" box.
...Stu