Just want to save this mapping URL on MSDN of SqlDbType to SqlType (the 'native' sql types you should use in Sql CLR code), since I expect to be doing some of that, shortly!

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfSystemDataSqlTypes.asp

[ETA: duh, you actually have to add the link]