That was definitley a nice article and the code works. I only had to do minor changes like:

exec sp_MSForEachDB 'Use [?] SELECT name AS ''Name of File'', size/128.0 -CAST(FILEPROPERTY(name, ''SpaceUsed'' )

AS float)/128.0 AS ''Available Space In MB'' FROM sysfiles'

They way you had it wriiten does not support case sensitive collation.