the biggest annoyance for me is simply app closing quietly and hidden. video and games etc pausing is not an issue imo. I thought a lot about fremantle multitasking (usb-port fell off, using c5 atm) and why android, ios and symbian just can't stand comparision in my eyes. "we have 'multitasking', the app in the background might be there when you next time check or then not and you have to go through menu hell in order to get it back up" is total dealbreaker for me.