Check out BLING.ps1 HERE. This link provides a preview of the next release of the project that will apparently all be based on PowerShell.
The project is called "Performance Analysis of Logs" (PAL).
"Ever have a performance problem, but don't know what performance counters to collect or how to analyze them? The PAL (Performance Analysis of Logs) tool is a new and powerful tool that reads in a performance monitor counter log (any known format) and analyzes it using complex, but known thresholds (provided). The tool generates an HTML based report which graphically charts important performance counters and throws alerts when thresholds are exceeded. The thresholds are originally based on thresholds defined by the Microsoft product teams and members of Microsoft support, but continue to be expanded by this ongoing project. This tool is not a replacement of traditional performance analysis, but it automates the analysis of performance counter logs enough to save you time. This is a VBScript and requires Microsoft LogParser (free download)."
I got an error when trying to run it with v2 CTP3 (XP SP2). I reported the issue on the site.