SPDisposeCheck will inspect your SharePoint assemblies and check that you are correctly disposing of certain SharePoint objects (IDisposable objects which includes SPSite and SPWeb).

It's based on the following MSDN article (Best Practices: Using Disposable Windows SharePoint Services Objects) and is the subject that I touched on some of my previous SharePoint Development speaking engagements.

Download is here: http://code.msdn.microsoft.com/SPDisposeCheck

Check the full article here: http://blogs.msdn.com/sharepoint/archive/2009/01/29/spdisposecheck-released.aspx

SharePoint Diagnostics (SPDiag) Tool v1.0 for SharePoint Products and Technologies. This will be SharePoint Administrator’s weapon.

With SPDiag v1.0 SharePoint Administrator can:

• Collect IIS and ULS log files, performance counter data, event logs, and WMI instrumentation data from a SharePoint farm.
• Filter data to show granular information related to specific servers, Web applications, HTTP requests, event IDs, URI queries, and almost any other data points captured through supported channels.
• Create custom reports that can help reveal performance trends over time.
• Create snapshots of your SharePoint farm that include detailed information about your farm's hardware, installed software and logical topology.
• Export collected data and reports that can be sent to Microsoft support personnel.

SPDiag v1.0 is included in the Microsoft SharePoint Administration Toolkit v3.0, available for download at the following locations:

• Microsoft SharePoint Administration Toolkit v3.0 x86: http://go.microsoft.com/fwlink/?LinkId=141504
• Microsoft SharePoint Administration Toolkit v3.0 x64: http://go.microsoft.com/fwlink/?LinkId=142035

Check the article here: http://blogs.msdn.com/sharepoint/archive/2009/02/05/sharepoint-diagnostics-spdiag-tool-v1-0-for-sharepoint-products-and-technologies.aspx