Gaps, Actual Positions and laptimes really come best through the official F1 app. I can’t think of a better app at the moment and that’s available on iOS (iPad/iPhone), BlackBerry (for what it’s worth – the BlackBerry version of the app is absolute rubbish. Not to mention F1fanatic is quite slow through the browser) and Android.
So take your pick…
Mind you I’m happy with the iOS version (I have an iPhone 4 – not 4S – and an iPad 3) but I don’t know anything about the Android version.