This lists database objects are in what filegroup:
select af.name, o.name, i.name, i.dpages, i.reserved, i.used, i.rowcnt, i.rows, i.rowmodctr, i.OrigFillFactor, o.crdate, o.refdate
from sysindexes i
inner join sysobjects o on o.id = i.id
inner join master..sysaltfiles af on af.dbid = DB_ID() and af.groupid = i.groupid
order by af.name, o.name, i.indid