Here are a couple of queries you can run. Hopefully this helps.
select plan_name from msdb.dbo.sysdbmaintplans
select plan_name, database_name, activity, start_time, duration/60 from msdb.dbo.sysdbmaintplan_history
where start_time > '11/01/2006'
select plan_name, database_name
from msdb.dbo.sysdbmaintplans inner join
msdb.dbo.sysdbmaintplan_databases on msdb.dbo.sysdbmaintplans.plan_id = msdb.dbo.sysdbmaintplan_databases.plan_id
select distinct plan_name, activity from msdb.dbo.sysdbmaintplan_history
where start_time > '05/08/2007'
