An interesting question about commands that I was not aware of.

However, your explanation of fn_helpcollations is not entirely accurate for those of us using 2008. BOL describes it as 'Returns a list of all the collations supported by SQL Server 2008' with a note 'Deprecated collations that are no longer supported or installed in SQL Server 2008 cannot be queried with fn_helpcollations'. I have no idea how the 2005 BOL describes it, but if you don't specify the version you need to be aware of all of the possible variations in the documentation.