As you might have noticed SharePoint 2010 has quite a few Application Pools running. Spence posted a series of
blogs about SharePoint 2010 Apllications Pools.
SharePoint Server 2010 Worker Processes
More on SharePoint 2010 Application Pools
Application Pool miss configuration in SharePoint 2010
Besides that he posted a new version of te
Application Pool Manager V3 a very handy tool for every SharePoint 2010 developer.