I was looking for a 'black box' type of recorder for the car (evidence in case of accident). Looked at a few with forward and rearward cameras, built in GPS etc. Pricing about £300. Then thought, maybe 'there is an app for that'. And sure enough, there are a few, but which is any good? Does anyone have experience with apps such as 'SIS Cockpit Recorder' or 'icarblackbox'. These seem like great value compared with standalone units, but are they any good? And can I run music and satnav apps at the same time? (I know the 3GS multitasks but to what extent?)