I've gotten into the habit of using FirstOrDefault instead of SingleOrDefault in my LINQ queries.  LINQ to Entities doesn't support SingleOrDefault. This helps create portable code that can move from LINQ to SQL to LINQ to Entities.

If you're in the Des Moines area on Saturday, you're welcome to stop by the Iowa Code Camp.  This is a free, all day session of code-centric presentation.  I'll be speaking about Advanced LINQ.  The following link has more details:

 

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A couple years ago, Kim Cameron gathered information from various sources in the Blogsphere on Internet Identity Management, The Laws of Identity.  These laws define an ideal identity metasystem for existing and future applications providing identity services.  Microsoft has embraced these laws in their Cardspace products, the latest of which is code-name "Geneva", which is the cornerstone of identity management in WinAZ.