SharePoint Monitoring Toolkit

http://www.microsoft.com/downloads/details.aspx?FamilyId=E4600FD9-F53D-4DED-88BF-6BB1932794F9&displaylang=en

Overview
The SharePoint Monitoring Toolkit helps you manage Microsoft® SharePoint® environments of all sizes with two new management packs for System Center Operations Manager 2007:

Windows® SharePoint Services 3.0 Management Pack
Microsoft Office SharePoint Server 2007 Management Pack

These packs monitor the health state of the components in your SharePoint environment that affect performance and availability. When there is an issue that may cause service or performance degradation, Operations Manager 2007 uses the management packs to detect the issue, alert you to its existence, and facilitate diagnosis and corrective actions.

The management packs monitor:
Windows SharePoint Services 3.0 related services (Timer, Tracing and Search)
Windows SharePoint Services 3.0 related Events
Web server applications such as Internet Information Services (IIS)
IIS-related Events
Microsoft SQL Server® database-related events
WSS Server performance

 Thx for the useful info :)

http://amila-kumanayake.blogspot.com/