Here is the link to the presentation on CRL in SQL, with guidance on when and when not to use it.
http://msevents.microsoft.com/cui/WebCastEventDetails.aspx?EventID=1032275334&EventCategory=5&culture=en-US&CountryCode=US
There is some interesting statements that corroborate my findings about CLR functions and TSQL functions. i.e. CLR functions are likely to be better than TSQL functions (http://www.sqljunkies.com/WebLog/simons/archive/2005/01/17/6468.aspx)