Good article here
http://blogs.msdn.com/b/russmax/archive/2010/02/10/sharepoint-2010-logging-improvements-part-2-introducing-developer-dashboard.aspx
Good article here for devs
http://www.sharepoint4developers.net/en-nz/post/sharepoint-2010-developer-dashboard.aspx
Todd on Developer Dashboard
http://www.toddklindt.com/blog/Lists/Posts/Post.aspx?ID=189
Monitoring SharePoint 2010 Performance and the Developer Dashboard
http://sharepoint.microsoft.com/Blogs/GetThePoint/Lists/Posts/Post.aspx?ID=457
Why SharePoint 2010 Developer Dashboard Is For All IT Professionals
http://blogs.msdn.com/b/chrisfie/archive/2010/01/29/why-sharepoint-2010-developer-dashboard-is-for-all-it-professionals.aspx
Bill Baer’s take on Developer Dashboard
http://blogs.technet.com/b/wbaer/archive/2009/11/21/welcome-to-the-developer-dashboard.aspx
Special Project - http://blogs.msdn.com/b/tejasr/archive/2011/07/01/sharepoint-2010-performance-dashboard-server-performance-reporting-post-1.aspx
QUICK NOTE: Although you can control Developer Dashboard with PowerShell to get more control an easy fast solution is to just use site?developerdashboard=true in your URL after your turn the developer dashboard on.
More on permissions
http://blogs.technet.com/b/speschka/archive/2009/10/28/using-the-developer-dashboard-in-sharepoint-2010.aspx