just in case if someone think i am suggesting Maemo to appear like iOs

by Layers this is what i mean

iOs
1(apps) + 0(multitasking)
= 1 Layer Os

Android
1(desktop) + 1(apps) + 0(multitasking) + 1(resent apps) + 1(surprise apps we find in task killer)
= 3.. no .. 4... i am Dyslexic to count

N9
1(app) + 1(multitasking) + 1(live update)
= 3 Layer Os

N900
1(Desktop) + 1(Multitasking) + 1(Apps)
= 3 Layer Os

N900(can be)
1(Multitasking) + 1(Apps) + 0(desktop)
= 2 Layers Os