Well actually yesterday I read that the new Symbian Multitasking Interface is going to be very similar to the Multitasking UI of Maemo.

For more info, see:
http://mynokiablog.com/2011/01/21/ne...bian-3-leaked/

Personally, I love the Maemo 5's UI because it is different in its own ways compared to other UI's around. It is easy to use and it just works (for me anyways).