I think this is new to Tiger, but there is a very nice activity monitor now ( I haven't checked it since Janguar). But with no app running at all - my idle % was 68%-92% on my ibook. When I started up AOL only, it dipped as low as 22%. So I would not install any other do-dads that are not needed. Its really a first class activity monitor however with moving graphs and such.
