Quick and dirty, run this from an SSMS query window (connected to the DB engine):

[font="Courier New"]declare @table1 table (id tinyint identity (1,1), data sysname)

declare @count smallint,

@i smallint,

@key nvarchar(8),

@sql nvarchar(1000)

set @i = 1

insert into @table1 (data)

exec xp_regenumkeys 'HKEY_LOCAL_MACHINE', 'Software\Microsoft\Microsoft SQL Server'

select @count = coalesce(count(*), -1)

from @table1

where upper(data) like 'MSSQL.%'

while @i <= @count

begin

set @key = 'MSSQL.' + cast(@i AS nvarchar(2))

set @sql = 'xp_regread ''HKEY_LOCAL_MACHINE'', ''Software\Microsoft\Microsoft SQL Server\' + @key + '\Setup'', ''Featurelist'''

exec (@sql)

set @sql = 'xp_regread ''HKEY_LOCAL_MACHINE'', ''Software\Microsoft\Microsoft SQL Server\' + @key + '\Setup'', ''Edition'''

exec (@sql)

set @i = @i + 1

end

[/font]

This will return installed features followed by editions for each installed product. NB - assumes stuff is installed as default instance.

Or you could just open regedit & browse to the keys listed above.