Configuring Single Sign On Service and Create WebPart

A good article on how to configure Single Sign On (SSO)
Once we setup the SSO on SharePoint server, you might need to develop a WebPart for SSO.
And here is the way to do that.
Some more links

http://www.sharepointblogs.com/llowevad/archive/2007/04/23/sharepoint-2007-single-sign-on-setup.aspx
http://blogs.msdn.com/roberdan/archive/2005/02/19/376629.aspx
http://geekswithblogs.net/tariq/archive/2004/09/07/10769.aspx
http://blogs.msdn.com/johnwe/archive/2005/02/16/374955.aspx
http://blogs.tamtam.nl/mart/ImpersonationSingleSignonAndSPS.aspx
http://www.sharepointblogs.com/charbel/archive/2007/05/01/moss-2007-single-sign-on-part-2.aspx
http://blog.u2u.info/DottextWeb/patrick/archive/2005/01/15/795.aspx