Rowan Simpson of Southgate Labs made an iOS app, Top Three, which does this a few years ago http://itunes.apple.com/nz/app/top-three/id377629136?mt=8...
Rowan Simpson of Southgate Labs made an iOS app, Top Three, which does this a few years ago http://itunes.apple.com/nz/app/top-three/id377629136?mt=8...