I've been manually collating Perfmon data (e.g., getting screen caps of the perfmon graph to get the average, min, max values) of statistics like % processor usage, % committed bytes in memory, etc in profiling an ASP.NET application for server sizing.
I'd like to know if there's a way to automate this, e.g., get specific perfmon statistics data from some log file or what not, and perhaps even having a report printed out of it?
You could use the Performance Analysis of Logs (PAL) Tool, an open source project hosted on CodePlex.
There is a nice article you could read: "Get a Handle on Windows Performance Analysis":
The article explains how to create an automated procedure using these tools:
Can't MOM/SCOM do this for you?
For what it sounds like you are trying to do, I usually just use the Counter Logs in Performance Monitor itself. I set the log file type to comma delimited and crunch the numbers with Excel.
Did you look at the "Trace Logs" area of PerfMon? It does allow scheduled start/stop/etc.