This is the best interactive idea of the year (ok, for beer drinkers) and I am sure many of you may already have seen it: the labels on some beer bottles change color to blue when the beer is the right chilly temperature. All this is the magic of temperature sensitive inks.

One of the keys to designing great interactive is that the system provides feedback to the user. Questions are answered consistently such as "where am I in the system?", and "Why am I waiting and for how long?", and "What just happened and how do I fix it?". There are many other examples.

I was surprised to see a beer bottle do a better job at this than most websites. Considering that the mass market beer bottle label or can has not changed in any meaningful way for decades, this is a pretty significant innovation. Hmmm... getting thirsty.

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