Best task manager/ calendar alarm?

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http://androidforums.com – Hello everybody. I arrived very recently to the android world after many years using nokia phones. The last one I used, a Nokia XpressMusic, had a fantastic task manager and although on everything else I've been feeling I upgraded my life turning to smartphones and specially to android software, on this item there was a downgrade. I learned very soon the native app of my android 2.3 wasn't any good, and I've tried a few things, but none of them fill the gap. So, my question is if anyone knows of an app similar to the one on Nokia phones? What I'm looking specifically is a calen (General)