Hmm. Do people multitasking when speaking on the phone. I mean if we got statistics I would predict that at least nearly 90% people use phone app and close call with phone apps end call button and do not surf around phone*. I do not see how this differs from that button if you have phone app open. Except that with this you have to click twice.

Still it´s nice feature and shows how convertible maemo is.

*Remind me about Operas UI testing where they collected statistics about what features people really use and IIRC it was pretty sad reading for power users. Most of users did use only little tiny amount of features what they were provided :| So...Apple is doing something right