SharePoint Diagnostic Studio
Talking of tools (see Favorite SharePoint Development Tools), the SharePoint Diagnostic Studio from Microsoft provides SharePoint performance monitoring functionality. This tool is particularly useful for consolidating the ULS records across servers in a SharePoint server farm. It’s part of the Microsoft SharePoint 2010 Administration Toolkit v2.0.
While useful, the user interface is not particularly polished or easy to use. In particular, the SharePoint Diagnostic Studio must be run with the language set to “US-English”, otherwise date formats will be presented incorrectly and date/time filtering will not work.
Overall Description: http://sharepoint.microsoft.com/blog/Pages/BlogPost.aspx?pID=971