I have written before about Amazon’s Kindle Ad Units – which are usually excellent. Here is the latest – and you will notice the similarity in prior units. Nevertheless, I love the tagline “Buy Once, Read Everywhere” because:

1. it sums up the Kindle’s value proposition perfectly (they won’t win on device, but portability is a big positive)

2. it leverages the success of other platforms – namely Apple (iPhone, iPad, Mac) and Android

3. it sums up so much of what consumers, publishers and developers alike are facing: the multi-platform conundrum (ie write once, read anyhwere)

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