Also noticed that these links take you to SQL 2008 pages (I guess the default links always refer to the latest version). You can follow the links at the top right of those pages for SQL2005, or use these modified links: put '(SQL.90)' before the '.aspx'

CLR - http://msdn.microsoft.com/en-us/library/ms345099(SQL.90).aspx

Database Mail - http://msdn.microsoft.com/en-us/library/ms175887(SQL.90).aspx

SQL mail: http://msdn.microsoft.com/en-us/library/ms177418(SQL.90).aspx

Web Assistance - http://msdn.microsoft.com/en-us/library/ms175576(SQL.90).aspx

Kev